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While trying to perform several actions on the environment, for example importing or exporting an application, the following error can be seen:
In the application server log file available in APPIAN_HOME/logs folder for Appian version 18.2 and newest or JBOSS_HOME/standalone/logs folder for Appian version 18.1 and previous, the following error is thrown:
APPIAN_HOME/logs
JBOSS_HOME/standalone/logs
blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]; (APNX-1-4198-000)
In the search server log file present in APPIAN_HOME/logs/search-server folder, this error might be present:
APPIAN_HOME/logs/search-server
org.elasticsearch.cluster.block.ClusterBlockException: blocked by: [FORBIDDEN/12/index read-only / allow delete (api)]
These above exceptions are related to a property in ElasticSearch: cluster.routing.allocation.disk.watermark.flood_stage. When Elasticsearch detects that the disk usage is more than 95%, it changes the indice to read-only which makes several actions unavailable on the environment. More information about this property are available in this documentation.
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:
On linux
curl -XPUT --header "Authorization: Basic YWRtaW46YQ==" "localhost:9200/_all/_settings" -H 'Content-Type: application/json' -d' { "index.blocks.read_only_allow_delete": null } '
On windows
Invoke-RestMethod -Method Put -Uri "http://localhost:9200/_all/_settings" -Header @{"Authorization" = "Basic YWRtaW46YQ=="} -Body '{"index.blocks.read_only_allow_delete": null}' -ContentType "application/json"
Verify that the following message appears after running the previous command:
{"acknowledged":true}
This article applies to all versions of Appian.
Last Reviewed: October 2018