<?xml version="1.0" encoding="UTF-8" ?>
<?xml-stylesheet type="text/xsl" href="https://community.appian.com/cfs-file/__key/system/syndication/rss.xsl" media="screen"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/"><channel><title>KB-1763 "HTTP Code: 500" error observed with ClusterBlockException or DiskThresholdMonitor error in the search server log</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log</link><description /><dc:language>en-US</dc:language><generator>Telligent Community 12</generator><item><title>KB-1763 "HTTP Code: 500" error observed with ClusterBlockException or DiskThresholdMonitor error in the search server log</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log</link><pubDate>Tue, 12 Mar 2024 13:22:52 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>pauline.delacruz</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Current Revision posted to Appian Knowledge Base by pauline.delacruz on 3/12/2024 1:22:52 PM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-11/7823.Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img alt=" " src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-11/7823.Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;div class="content-scrollable-wrapper content-scrollable-wrapper-scrolled"&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;/div&gt;
&lt;p&gt;&lt;span&gt;One or both of the following errors are also seen in the search server log&amp;nbsp;&lt;/span&gt;(located at&amp;nbsp;&lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;div class="content-scrollable-wrapper content-scrollable-wrapper-scrolled"&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;/div&gt;
&lt;div class="content-scrollable-wrapper content-scrollable-wrapper-scrolled"&gt;
&lt;pre&gt;[WARN ][org.elasticsearch.cluster.routing.allocation.DiskThresholdMonitor] [Node &amp;lt;HOSTNAME&amp;gt;:&amp;lt;SEARCH_SERVER_PORT&amp;gt;] flood stage disk watermark [95%] exceeded on [&amp;lt;HOSTNAME&amp;gt;][Node &amp;lt;HOSTNAME&amp;gt;:&amp;lt;SEARCH_SERVER_PORT&amp;gt;][&amp;lt;APPIAN_HOME&amp;gt;/search-server/data/nodes/0] free: X.Xgb[X.X%], all indices on this node will be marked read-only&lt;/pre&gt;
&lt;/div&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in Elasticsearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" rel="noopener noreferrer" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following commands to unblock the indices:&lt;/p&gt;
&lt;h3&gt;Linux&lt;/h3&gt;
&lt;ol&gt;
&lt;li&gt;Authenticate with the search server
&lt;div class="content-scrollable-wrapper content-scrollable-wrapper-scrolled"&gt;
&lt;pre&gt;APIKEY=$(awk &amp;#39;/^conf.data.search-server.restclient.apiKey=/ { match($0, /conf.data.search-server.restclient.apiKey=(.*)/, arr); print arr[1] }&amp;#39; &amp;lt;APPIAN_HOME&amp;gt;/conf/custom.properties);&lt;br /&gt;AUTHHEADER=&amp;quot;Authorization: ApiKey $(echo -n $APIKEY | base64 -w0)&amp;quot;;&lt;br /&gt;alias curl=&amp;#39;curl --header &amp;quot;$AUTHHEADER&amp;quot;&amp;#39;
&lt;/pre&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;Unblock the indices that are in read-only state
&lt;div class="content-scrollable-wrapper content-scrollable-wrapper-scrolled"&gt;
&lt;pre&gt;curl -XPUT &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;After the command finishes, the following message will be outputted:&lt;code&gt;&amp;nbsp;{&amp;quot;acknowledged&amp;quot;:true}&lt;/code&gt;&lt;/li&gt;
&lt;/ol&gt;
&lt;h3&gt;Windows&lt;/h3&gt;
&lt;ol&gt;
&lt;li&gt;&lt;strong&gt;Note:&lt;/strong&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;Run the command in PowerShell or Command Prompt (&lt;strong&gt;cmd.exe&lt;/strong&gt;), if it is configured to run as PowerShell.&amp;nbsp;
&lt;div class="content-scrollable-wrapper content-scrollable-wrapper-scrolled"&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;/div&gt;
&lt;/li&gt;
&lt;li&gt;Verify that the following message appears after running the above command:&lt;code&gt;&amp;nbsp;{&amp;quot;acknowledged&amp;quot;:true}&lt;/code&gt;&lt;/li&gt;
&lt;/ol&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed:&amp;nbsp;March 2024&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: DiskThresholdMonitor, administration, 500, search server, disk usage, infrastructure, disk, ClusterBlockException&lt;/div&gt;
</description></item><item><title>KB-1763 "HTTP Code: 500" error observed with ClusterBlockException or DiskThresholdMonitor error in the search server log</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/20</link><pubDate>Tue, 30 Jun 2020 21:10:49 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Rebecca Jonas</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 20 posted to Appian Knowledge Base by Rebecca Jonas on 6/30/2020 9:10:49 PM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img alt=" " src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;&lt;span&gt;One or both of the following errors are also seen in the search server log&amp;nbsp;&lt;/span&gt;(located at&amp;nbsp;&lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;pre&gt;[WARN ][org.elasticsearch.cluster.routing.allocation.DiskThresholdMonitor] [Node &amp;lt;HOSTNAME&amp;gt;:&amp;lt;SEARCH_SERVER_PORT&amp;gt;] flood stage disk watermark [95%] exceeded on [&amp;lt;HOSTNAME&amp;gt;][Node &amp;lt;HOSTNAME&amp;gt;:&amp;lt;SEARCH_SERVER_PORT&amp;gt;][&amp;lt;APPIAN_HOME&amp;gt;/search-server/data/nodes/0] free: X.Xgb[X.X%], all indices on this node will be marked read-only&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in Elasticsearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" rel="noopener noreferrer" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to unblock the indices:&lt;/p&gt;
&lt;h3&gt;Linux&lt;/h3&gt;
&lt;pre&gt;curl -XPUT --header &amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot; &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;h3&gt;Windows&lt;/h3&gt;
&lt;p&gt;&lt;strong&gt;Note:&lt;/strong&gt; Run the command in PowerShell or Command Prompt (&lt;strong&gt;cmd.exe&lt;/strong&gt;), if it is configured to run as PowerShell.&amp;nbsp;&lt;/p&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&amp;quot;acknowledged&amp;quot;:true}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: January 2020&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: DiskThresholdMonitor, administration, 500, search server, disk usage, infrastructure, disk, ClusterBlockException&lt;/div&gt;
</description></item><item><title>KB-1763 "HTTP Code: 500" error observed with ClusterBlockException or DiskThresholdMonitor error in the search server log</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/19</link><pubDate>Tue, 30 Jun 2020 21:09:01 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Rebecca Jonas</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 19 posted to Appian Knowledge Base by Rebecca Jonas on 6/30/2020 9:09:01 PM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img alt=" " src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;&lt;span&gt;One or both of the following errors are also seen in the search server log&amp;nbsp;&lt;/span&gt;(located at&amp;nbsp;&lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;pre&gt;[WARN ][org.elasticsearch.cluster.routing.allocation.DiskThresholdMonitor] [Node &amp;lt;HOSTNAME&amp;gt;:&amp;lt;SEARCH_SERVER_PORT&amp;gt;] flood stage disk watermark [95%] exceeded on [&amp;lt;HOSTNAME&amp;gt;][Node &amp;lt;HOSTNAME&amp;gt;:&amp;lt;SEARCH_SERVER_PORT&amp;gt;][&amp;lt;APPIAN_HOME&amp;gt;/search-server/data/nodes/0] free: X.Xgb[X.X%], all indices on this node will be marked read-only&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in Elasticsearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" rel="noopener noreferrer" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to unblock the indices:&lt;/p&gt;
&lt;h3&gt;Linux&lt;/h3&gt;
&lt;pre&gt;curl -XPUT --header &amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot; &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;h3&gt;Windows&lt;/h3&gt;
&lt;p&gt;&lt;strong&gt;Note:&lt;/strong&gt; Run the command in PowerShell or Command Prompt (&lt;strong&gt;cmd.exe&lt;/strong&gt;), if it is configured to run as PowerShell.&amp;nbsp;&lt;/p&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&amp;quot;acknowledged&amp;quot;:true}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: January 2020&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: administration, 500, search server, disk usage, infrastructure, disk&lt;/div&gt;
</description></item><item><title>KB-1763 "HTTP Code: 500" error observed when performing several actions in the environment</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/18</link><pubDate>Wed, 29 Jan 2020 05:41:03 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Parmida Borhani</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 18 posted to Appian Knowledge Base by Parmida Borhani on 1/29/2020 5:41:03 AM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img alt=" " src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;&lt;span&gt;One or both of the following errors are also seen in the search server log&amp;nbsp;&lt;/span&gt;(located at&amp;nbsp;&lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;pre&gt;[WARN ][org.elasticsearch.cluster.routing.allocation.DiskThresholdMonitor] [Node &amp;lt;HOSTNAME&amp;gt;:&amp;lt;SEARCH_SERVER_PORT&amp;gt;] flood stage disk watermark [95%] exceeded on [&amp;lt;HOSTNAME&amp;gt;][Node &amp;lt;HOSTNAME&amp;gt;:&amp;lt;SEARCH_SERVER_PORT&amp;gt;][&amp;lt;APPIAN_HOME&amp;gt;/search-server/data/nodes/0] free: X.Xgb[X.X%], all indices on this node will be marked read-only&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in Elasticsearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" rel="noopener noreferrer" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to unblock the indices:&lt;/p&gt;
&lt;h3&gt;Linux&lt;/h3&gt;
&lt;pre&gt;curl -XPUT --header &amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot; &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;h3&gt;Windows&lt;/h3&gt;
&lt;p&gt;&lt;strong&gt;Note:&lt;/strong&gt; Run the command in PowerShell or Command Prompt (&lt;strong&gt;cmd.exe&lt;/strong&gt;), if it is configured to run as PowerShell.&amp;nbsp;&lt;/p&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&amp;quot;acknowledged&amp;quot;:true}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: January 2020&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: administration, 500, search server, disk usage, infrastructure, disk&lt;/div&gt;
</description></item><item><title>KB-1763 "HTTP Code: 500" error observed when performing several actions in the environment</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/17</link><pubDate>Mon, 18 Nov 2019 01:03:09 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Parmida Borhani</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 17 posted to Appian Knowledge Base by Parmida Borhani on 11/18/2019 1:03:09 AM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img alt=" " src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;&lt;span&gt;One or both of the following errors are also seen in the search server log&amp;nbsp;&lt;/span&gt;(located at&amp;nbsp;&lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;pre&gt;[WARN ][org.elasticsearch.cluster.routing.allocation.DiskThresholdMonitor] [Node &amp;lt;HOSTNAME&amp;gt;:&amp;lt;SEARCH_SERVER_PORT&amp;gt;] flood stage disk watermark [95%] exceeded on [&amp;lt;HOSTNAME&amp;gt;][Node &amp;lt;HOSTNAME&amp;gt;:&amp;lt;SEARCH_SERVER_PORT&amp;gt;][&amp;lt;APPIAN_HOME&amp;gt;/search-server/data/nodes/0] free: X.Xgb[X.X%], all indices on this node will be marked read-only&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in Elasticsearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" rel="noopener noreferrer" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to clear the indices:&lt;/p&gt;
&lt;h3&gt;Linux&lt;/h3&gt;
&lt;pre&gt;curl -XPUT --header &amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot; &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;h3&gt;Windows&lt;/h3&gt;
&lt;p&gt;&lt;strong&gt;Note:&lt;/strong&gt; Run the command in PowerShell or Command Prompt (&lt;strong&gt;cmd.exe&lt;/strong&gt;), if it is configured to run as PowerShell.&amp;nbsp;&lt;/p&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&amp;quot;acknowledged&amp;quot;:true}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: November 2019&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: administration, 500, search server, disk usage, infrastructure, disk&lt;/div&gt;
</description></item><item><title>KB-1763 "HTTP Code: 500" error observed when performing several actions in the environment</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/16</link><pubDate>Mon, 18 Nov 2019 01:02:18 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Parmida Borhani</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 16 posted to Appian Knowledge Base by Parmida Borhani on 11/18/2019 1:02:18 AM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img alt=" " src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;&lt;span&gt;One or both of the following errors are also seen in the search server log&amp;nbsp;&lt;/span&gt;(located at&amp;nbsp;&lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;pre&gt;[WARN ][org.elasticsearch.cluster.routing.allocation.DiskThresholdMonitor] [Node &amp;lt;HOSTNAME&amp;gt;:&amp;lt;SEARCH_SERVER_PORT&amp;gt;] flood stage disk watermark [95%] exceeded on [&amp;lt;HOSTNAME&amp;gt;][Node &amp;lt;HOSTNAME&amp;gt;:&amp;lt;SEARCH_SERVER_PORT&amp;gt;][&amp;lt;APPIAN_HOME&amp;gt;/search-server/data/nodes/0] free: X.Xgb[X.X%], all indices on this node will be marked read-only&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in Elasticsearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" rel="noopener noreferrer" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to clear the indices:&lt;/p&gt;
&lt;h3&gt;Linux&lt;/h3&gt;
&lt;pre&gt;curl -XPUT --header &amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot; &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;h3&gt;Windows&lt;/h3&gt;
&lt;p&gt;&lt;strong&gt;Note:&lt;/strong&gt; Run the command in PowerShell or Command Prompt (&lt;strong&gt;cmd.exe&lt;/strong&gt;), if it is configured to run as PowerShell.&amp;nbsp;&lt;/p&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&amp;quot;acknowledged&amp;quot;:true}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: November 2019&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item><item><title>KB-1763 "HTTP Code: 500" error observed when performing several actions in the environment</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/15</link><pubDate>Thu, 15 Aug 2019 05:31:51 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Parmida Borhani</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 15 posted to Appian Knowledge Base by Parmida Borhani on 8/15/2019 5:31:51 AM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img alt=" " src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;The following error is also seen in the search server log (located at In the search server log &lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in Elasticsearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" rel="noopener noreferrer" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to clear the indices:&lt;/p&gt;
&lt;h3&gt;Linux&lt;/h3&gt;
&lt;pre&gt;curl -XPUT --header &amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot; &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;h3&gt;Windows&lt;/h3&gt;
&lt;p&gt;&lt;strong&gt;Note:&lt;/strong&gt; Run the command in PowerShell or Command Prompt (&lt;strong&gt;cmd.exe&lt;/strong&gt;), if it is configured to run as PowerShell.&amp;nbsp;&lt;/p&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&amp;quot;acknowledged&amp;quot;:true}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: August 2019&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item><item><title>KB-1763 "HTTP Code: 500" error observed when performing several actions in the environment</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/14</link><pubDate>Thu, 15 Aug 2019 05:31:36 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Parmida Borhani</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 14 posted to Appian Knowledge Base by Parmida Borhani on 8/15/2019 5:31:36 AM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img alt=" " src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;The following error is also seen in the search server log (located at In the search server log &lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in Elasticsearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" rel="noopener noreferrer" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to clear the indices:&lt;/p&gt;
&lt;h3&gt;Linux&lt;/h3&gt;
&lt;pre&gt;curl -XPUT --header &amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot; &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;h3&gt;Windows&lt;/h3&gt;
&lt;p&gt;Note: Run the command in PowerShell or Command Prompt (&lt;strong&gt;cmd.exe&lt;/strong&gt;), if it is configured to run as PowerShell.&amp;nbsp;&lt;/p&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&amp;quot;acknowledged&amp;quot;:true}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: August 2019&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item><item><title>KB-1763 HTTP 500 Error observed when performing several actions in the environment</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/12</link><pubDate>Fri, 26 Oct 2018 21:39:55 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Jordan Horwat</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 12 posted to Appian Knowledge Base by Jordan Horwat on 10/26/2018 9:39:55 PM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;The following error is also seen in the search server log (located at In the search server log &lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in Elasticsearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to clear the indices:&lt;/p&gt;
&lt;h3&gt;Linux&lt;/h3&gt;
&lt;pre&gt;curl -XPUT --header &amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot; &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;h3&gt;Windows&lt;/h3&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&amp;quot;acknowledged&amp;quot;:true}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: October 2018&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item><item><title>KB-1763 "HTTP Code: 500" error observed when performing several actions in the environment</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/13</link><pubDate>Fri, 26 Oct 2018 17:41:17 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Jordan Horwat</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 13 posted to Appian Knowledge Base by Jordan Horwat on 10/26/2018 5:41:17 PM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-11/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;The following error is also seen in the search server log (located at In the search server log &lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in Elasticsearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to clear the indices:&lt;/p&gt;
&lt;h3&gt;Linux&lt;/h3&gt;
&lt;pre&gt;curl -XPUT --header &amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot; &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;h3&gt;Windows&lt;/h3&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&amp;quot;acknowledged&amp;quot;:true}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: October 2018&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item><item><title>KB-1763 HTTP 500 Error observed when performing several actions in the environment</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/11</link><pubDate>Fri, 26 Oct 2018 17:39:55 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Jordan Horwat</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 11 posted to Appian Knowledge Base by Jordan Horwat on 10/26/2018 5:39:55 PM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;The following error is also seen in the search server log (located at In the search server log &lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in Elasticsearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to clear the indices:&lt;/p&gt;
&lt;h3&gt;Linux&lt;/h3&gt;
&lt;pre&gt;curl -XPUT --header &amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot; &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;h3&gt;Windows&lt;/h3&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&amp;quot;acknowledged&amp;quot;:true}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: October 2018&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item><item><title>DRAFT KB-XXXX Unable to perform several actions in the environment due to a FORBIDDEN error</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/10</link><pubDate>Fri, 26 Oct 2018 16:58:01 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Jordan Horwat</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 10 posted to Appian Knowledge Base by Jordan Horwat on 10/26/2018 4:58:01 PM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;The following error is also seen in the search server log (located at In the search server log &lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in Elasticsearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to clear the indices:&lt;/p&gt;
&lt;h3&gt;Linux&lt;/h3&gt;
&lt;pre&gt;curl -XPUT --header &amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot; &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;h3&gt;Windows&lt;/h3&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&amp;quot;acknowledged&amp;quot;:true}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: October 2018&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item><item><title>DRAFT KB-XXXX Unable to perform several actions in the environment due to a FORBIDDEN error</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/9</link><pubDate>Fri, 26 Oct 2018 16:57:50 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Jordan Horwat</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 9 posted to Appian Knowledge Base by Jordan Horwat on 10/26/2018 4:57:50 PM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;The following error is also seen in the search server log (located at In the search server log &lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in Elasticsearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to clear the indices:&lt;/p&gt;
&lt;h3&gt;Linux&lt;/h3&gt;
&lt;pre&gt;curl -XPUT --header &amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot; &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;h3&gt;&lt;strong&gt;Windows&lt;/strong&gt;&lt;/h3&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&amp;quot;acknowledged&amp;quot;:true}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: October 2018&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item><item><title>DRAFT KB-XXXX Unable to perform several actions in the environment due to a FORBIDDEN error</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/8</link><pubDate>Fri, 26 Oct 2018 16:56:21 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Jordan Horwat</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 8 posted to Appian Knowledge Base by Jordan Horwat on 10/26/2018 4:56:21 PM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;The following error is also seen in the search server log (located at In the search server log &lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in Elasticsearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to clear the indices:&lt;/p&gt;
&lt;h3&gt;&lt;strong&gt;Linux&lt;/strong&gt;&lt;/h3&gt;
&lt;pre&gt;curl -XPUT --header &amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot; &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;h3&gt;&lt;strong&gt;Windows&lt;/strong&gt;&lt;/h3&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&amp;quot;acknowledged&amp;quot;:true}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: October 2018&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item><item><title>DRAFT KB-XXXX Unable to perform several actions in the environment due to a FORBIDDEN error</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/7</link><pubDate>Fri, 26 Oct 2018 16:55:27 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Jordan Horwat</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 7 posted to Appian Knowledge Base by Jordan Horwat on 10/26/2018 4:55:27 PM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;The following error is also seen in the search server log (located at In the search server log &lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in Elasticsearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to clear the indices:&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;Linux&lt;/strong&gt;&lt;/p&gt;
&lt;pre&gt;curl -XPUT --header &amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot; &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;p&gt;&lt;strong&gt;Windows&lt;/strong&gt;&lt;/p&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&amp;quot;acknowledged&amp;quot;:true}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: October 2018&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item><item><title>DRAFT KB-XXXX Unable to perform several actions in the environment due to a FORBIDDEN error</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/6</link><pubDate>Fri, 26 Oct 2018 16:52:42 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Jordan Horwat</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 6 posted to Appian Knowledge Base by Jordan Horwat on 10/26/2018 4:52:42 PM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;The following error is also seen in the search server log (located at In the search server log &lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in ElasticSearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;ElasticSearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to clear the indices:&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;Linux&lt;/strong&gt;&lt;/p&gt;
&lt;pre&gt;curl -XPUT --header &amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot; &amp;quot;localhost:9200/_all/_settings&amp;quot; -H &amp;#39;Content-Type: application/json&amp;#39; -d&amp;#39; { &amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null } &amp;#39;&lt;/pre&gt;
&lt;p&gt;&lt;strong&gt;Windows&lt;/strong&gt;&lt;/p&gt;
&lt;pre&gt;Invoke-RestMethod -Method Put -Uri &amp;quot;http://localhost:9200/_all/_settings&amp;quot; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: null}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&amp;quot;acknowledged&amp;quot;:true}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: October 2018&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item><item><title>DRAFT KB-XXXX Unable to perform several actions in the environment due to a FORBIDDEN error</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/5</link><pubDate>Fri, 26 Oct 2018 16:51:49 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Jordan Horwat</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 5 posted to Appian Knowledge Base by Jordan Horwat on 10/26/2018 4:51:49 PM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;The following error is also seen in the search server log (located at In the search server log &lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server&lt;/code&gt;):&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in ElasticSearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;ElasticSearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to clear the indices:&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;Linux&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;&lt;code&gt;curl -XPUT --header &lt;span class="code-quote"&gt;&amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot;&lt;/span&gt; &lt;span class="code-quote"&gt;&amp;quot;localhost:9200/_all/_settings&amp;quot;&lt;/span&gt; -H &lt;span class="code-quote"&gt;&amp;#39;Content-Type: application/json&amp;#39;&lt;/span&gt; -d&amp;#39; { &lt;span class="code-quote"&gt;&amp;quot;index.blocks.read_only_allow_delete&amp;quot;&lt;/span&gt;: &lt;span class="code-keyword"&gt;null&lt;/span&gt; } &amp;#39;&lt;/code&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;Windows&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;&lt;code&gt;Invoke-RestMethod -Method Put -Uri &lt;span class="code-quote"&gt;&amp;quot;http:&lt;span class="code-comment"&gt;//localhost:9200/_all/_settings&amp;quot;&lt;/span&gt; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: &lt;span class="code-keyword"&gt;null&lt;/span&gt;}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/span&gt;&lt;/code&gt;&lt;/p&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&lt;span class="code-quote"&gt;&amp;quot;acknowledged&amp;quot;&lt;/span&gt;:&lt;span class="code-keyword"&gt;true&lt;/span&gt;}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: October 2018&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item><item><title>DRAFT KB-XXXX Unable to perform several actions in the environment due to a FORBIDDEN error</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/4</link><pubDate>Fri, 26 Oct 2018 16:51:18 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Jordan Horwat</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 4 posted to Appian Knowledge Base by Jordan Horwat on 10/26/2018 4:51:18 PM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;When performing&amp;nbsp;several actions on the environment (for example, importing or exporting an application), the following error is observed:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;The following error is also seen in the search server log (located at In the search server log &lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server):&lt;/code&gt;&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in ElasticSearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;ElasticSearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to clear the indices:&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;Linux&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;&lt;code&gt;curl -XPUT --header &lt;span class="code-quote"&gt;&amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot;&lt;/span&gt; &lt;span class="code-quote"&gt;&amp;quot;localhost:9200/_all/_settings&amp;quot;&lt;/span&gt; -H &lt;span class="code-quote"&gt;&amp;#39;Content-Type: application/json&amp;#39;&lt;/span&gt; -d&amp;#39; { &lt;span class="code-quote"&gt;&amp;quot;index.blocks.read_only_allow_delete&amp;quot;&lt;/span&gt;: &lt;span class="code-keyword"&gt;null&lt;/span&gt; } &amp;#39;&lt;/code&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;Windows&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;&lt;code&gt;Invoke-RestMethod -Method Put -Uri &lt;span class="code-quote"&gt;&amp;quot;http:&lt;span class="code-comment"&gt;//localhost:9200/_all/_settings&amp;quot;&lt;/span&gt; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: &lt;span class="code-keyword"&gt;null&lt;/span&gt;}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/span&gt;&lt;/code&gt;&lt;/p&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&lt;span class="code-quote"&gt;&amp;quot;acknowledged&amp;quot;&lt;/span&gt;:&lt;span class="code-keyword"&gt;true&lt;/span&gt;}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: October 2018&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item><item><title>DRAFT KB-XXXX Unable to perform several actions in the environment due to a FORBIDDEN error</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/3</link><pubDate>Fri, 26 Oct 2018 16:50:11 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Jordan Horwat</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 3 posted to Appian Knowledge Base by Jordan Horwat on 10/26/2018 4:50:11 PM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;While trying to perform several actions on the environment, for example importing or exporting an application, the following error can be seen:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;The following error is seen in the application server log:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;The following error is also seen in the search server log (located at In the search server log &lt;code&gt;&amp;lt;APPIAN_HOME&amp;gt;/logs/search-server):&lt;/code&gt;&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in ElasticSearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;ElasticSearch detects that the disk usage is more than 95%, it changes the indices to read-only, which&amp;nbsp;makes several actions unavailable on the environment. More information about this property&amp;nbsp;can be found in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first&amp;nbsp;reduce the disk usage or add more disk space to the server. Then,&amp;nbsp;execute the following command to clear the indices:&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;Linux&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;&lt;code&gt;curl -XPUT --header &lt;span class="code-quote"&gt;&amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot;&lt;/span&gt; &lt;span class="code-quote"&gt;&amp;quot;localhost:9200/_all/_settings&amp;quot;&lt;/span&gt; -H &lt;span class="code-quote"&gt;&amp;#39;Content-Type: application/json&amp;#39;&lt;/span&gt; -d&amp;#39; { &lt;span class="code-quote"&gt;&amp;quot;index.blocks.read_only_allow_delete&amp;quot;&lt;/span&gt;: &lt;span class="code-keyword"&gt;null&lt;/span&gt; } &amp;#39;&lt;/code&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;Windows&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;&lt;code&gt;Invoke-RestMethod -Method Put -Uri &lt;span class="code-quote"&gt;&amp;quot;http:&lt;span class="code-comment"&gt;//localhost:9200/_all/_settings&amp;quot;&lt;/span&gt; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: &lt;span class="code-keyword"&gt;null&lt;/span&gt;}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/span&gt;&lt;/code&gt;&lt;/p&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the above command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&lt;span class="code-quote"&gt;&amp;quot;acknowledged&amp;quot;&lt;/span&gt;:&lt;span class="code-keyword"&gt;true&lt;/span&gt;}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: October 2018&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item><item><title>DRAFT KB-XXXX Unable to perform several actions in the environment due to a FORBIDDEN error</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/1</link><pubDate>Tue, 23 Oct 2018 09:55:42 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Diaba Konate</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 1 posted to Appian Knowledge Base by Diaba Konate on 10/23/2018 9:55:42 AM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;While trying to perform several actions on the environment, for example importing or exporting an application, the following error can be seen:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;In the application server log file available in &lt;code&gt;APPIAN_HOME/logs&lt;/code&gt; folder for Appian version 18.2 and newest or &lt;code&gt;JBOSS_HOME/standalone/logs&lt;/code&gt; folder for Appian version 18.1 and previous, the following error is thrown:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;In the search server log file present in &lt;code&gt;APPIAN_HOME/logs/search-server&lt;/code&gt; folder, this error might be present:&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in ElasticSearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indice to read-only which&amp;nbsp;makes several actions unavailable on the environment. More information about this property are available in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;p&gt;&amp;nbsp;&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first make sure to reduce the disk usage or add more disk space to the server. Then run the following command to clear the indice:&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;On linux&lt;/strong&gt;&lt;/p&gt;
&lt;pre&gt;&lt;code&gt;curl -XPUT --header &lt;span class="code-quote"&gt;&amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot;&lt;/span&gt; &lt;span class="code-quote"&gt;&amp;quot;localhost:9200/_all/_settings&amp;quot;&lt;/span&gt; -H &lt;span class="code-quote"&gt;&amp;#39;Content-Type: application/json&amp;#39;&lt;/span&gt; -d&amp;#39;
{
  &lt;span class="code-quote"&gt;&amp;quot;index.blocks.read_only_allow_delete&amp;quot;&lt;/span&gt;: &lt;span class="code-keyword"&gt;null&lt;/span&gt;
}
&amp;#39;&lt;/code&gt; &lt;/pre&gt;
&lt;p&gt;&lt;strong&gt;On windows&lt;/strong&gt;&lt;/p&gt;
&lt;pre&gt;&lt;code&gt;Invoke-RestMethod -Method Put -Uri &lt;span class="code-quote"&gt;&amp;quot;http:&lt;span class="code-comment"&gt;//localhost:9200/_all/_settings&amp;quot;&lt;/span&gt; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: &lt;span class="code-keyword"&gt;null&lt;/span&gt;}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/span&gt;&lt;/code&gt;&lt;/pre&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the previous command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&lt;span class="code-quote"&gt;&amp;quot;acknowledged&amp;quot;&lt;/span&gt;:&lt;span class="code-keyword"&gt;true&lt;/span&gt;}&lt;/pre&gt;
&lt;p&gt;&amp;nbsp;&lt;/p&gt;
&lt;h2&gt;&amp;nbsp;&lt;/h2&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: October 2018&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item><item><title>DRAFT KB-XXXX Unable to perform several actions in the environment due to a FORBIDDEN error</title><link>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log/revision/2</link><pubDate>Tue, 23 Oct 2018 05:58:01 GMT</pubDate><guid isPermaLink="false">d3a83456-d57b-489c-a84c-4e8267bb592a:6ef111bc-0b4c-4307-867a-6c43a95c89c4</guid><dc:creator>Diaba Konate</dc:creator><comments>https://community.appian.com/support/w/kb/1185/kb-1763-http-code-500-error-observed-with-clusterblockexception-or-diskthresholdmonitor-error-in-the-search-server-log#comments</comments><description>Revision 2 posted to Appian Knowledge Base by Diaba Konate on 10/23/2018 5:58:01 AM&lt;br /&gt;
&lt;h2&gt;Symptoms&lt;/h2&gt;
&lt;p&gt;While trying to perform several actions on the environment, for example importing or exporting an application, the following error can be seen:&lt;/p&gt;
&lt;p&gt;&lt;a href="/cfs-file/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png"&gt;&lt;img src="/resized-image/__size/1200x0/__key/communityserver-wikis-components-files/00-00-00-00-13/Screenshot-2018_2D00_09_2D00_06-at-09.17.59.png" alt=" " /&gt;&lt;/a&gt;&lt;/p&gt;
&lt;p&gt;In the application server log file available in &lt;code&gt;APPIAN_HOME/logs&lt;/code&gt; folder for Appian version 18.2 and newest or &lt;code&gt;JBOSS_HOME/standalone/logs&lt;/code&gt; folder for Appian version 18.1 and previous, the following error is thrown:&lt;/p&gt;
&lt;pre&gt;blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)&lt;/pre&gt;
&lt;p&gt;In the search server log file present in &lt;code&gt;APPIAN_HOME/logs/search-server&lt;/code&gt; folder, this error might be present:&lt;/p&gt;
&lt;pre&gt;org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]&lt;/pre&gt;
&lt;h2&gt;Cause&lt;/h2&gt;
&lt;p&gt;These above exceptions are related to a property in ElasticSearch:&amp;nbsp;&lt;strong&gt;cluster.routing.allocation.disk.watermark.flood_stage&lt;/strong&gt;. When&amp;nbsp;Elasticsearch detects that the disk usage is more than 95%, it changes the indice to read-only which&amp;nbsp;makes several actions unavailable on the environment. More information about this property are available in this &lt;a href="https://www.elastic.co/guide/en/elasticsearch/reference/6.2/disk-allocator.html" target="_blank"&gt;documentation&lt;/a&gt;.&lt;/p&gt;
&lt;h2&gt;Action&lt;/h2&gt;
&lt;p&gt;To solve this issue, first make sure to reduce the disk usage or add more disk space to the server. Then run the following command to clear the indice:&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;On linux&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;&lt;code&gt;curl -XPUT --header &lt;span class="code-quote"&gt;&amp;quot;Authorization: Basic YWRtaW46YQ==&amp;quot;&lt;/span&gt; &lt;span class="code-quote"&gt;&amp;quot;localhost:9200/_all/_settings&amp;quot;&lt;/span&gt; -H &lt;span class="code-quote"&gt;&amp;#39;Content-Type: application/json&amp;#39;&lt;/span&gt; -d&amp;#39; { &lt;span class="code-quote"&gt;&amp;quot;index.blocks.read_only_allow_delete&amp;quot;&lt;/span&gt;: &lt;span class="code-keyword"&gt;null&lt;/span&gt; } &amp;#39;&lt;/code&gt;&lt;/p&gt;
&lt;p&gt;&lt;strong&gt;On windows&lt;/strong&gt;&lt;/p&gt;
&lt;p&gt;&lt;code&gt;Invoke-RestMethod -Method Put -Uri &lt;span class="code-quote"&gt;&amp;quot;http:&lt;span class="code-comment"&gt;//localhost:9200/_all/_settings&amp;quot;&lt;/span&gt; -Header @{&amp;quot;Authorization&amp;quot; = &amp;quot;Basic YWRtaW46YQ==&amp;quot;} -Body &amp;#39;{&amp;quot;index.blocks.read_only_allow_delete&amp;quot;: &lt;span class="code-keyword"&gt;null&lt;/span&gt;}&amp;#39; -ContentType &amp;quot;application/json&amp;quot;&lt;/span&gt;&lt;/code&gt;&lt;/p&gt;
&lt;p&gt;&lt;span class="code-quote"&gt;Verify that the following message appears after running the previous command:&lt;/span&gt;&lt;/p&gt;
&lt;pre&gt;{&lt;span class="code-quote"&gt;&amp;quot;acknowledged&amp;quot;&lt;/span&gt;:&lt;span class="code-keyword"&gt;true&lt;/span&gt;}&lt;/pre&gt;
&lt;h2&gt;Affected Versions&lt;/h2&gt;
&lt;p&gt;This article applies to all versions of Appian.&lt;/p&gt;
&lt;p&gt;Last Reviewed: October 2018&lt;/p&gt;&lt;div style="clear:both;"&gt;&lt;/div&gt;

&lt;div style="font-size: 90%;"&gt;Tags: search server, infrastructure&lt;/div&gt;
</description></item></channel></rss>