https://community.appian.com/discussions/f/administration/12448/while-upgrading-the-from-17-3-to-18-1-i-missed-following-stepWhile upgrading the from 17.3 to 18.1, i missed following step. Though environment is up and seems to be fine but can i do it no after shutting down the environment? Will there be any issue? Step-Delete the following directories in your new Appian installationen-USTelligent Community 12https://community.appian.com/thread/55879?ContentTypeID=1Tue, 29 May 2018 10:44:37 GMTd3a83456-d57b-489c-a84c-4e8267bb592a:ad8f5b5d-b4bb-4447-be9c-c9298f351fe2Sergio BlazquezHello Piyush,<br /> <br /> I&#39;m not sure I understood what you mean with &quot;but can i do it no after shutting down the environment?&quot;<br /> <br /> It&#39;s important to &quot;recreate&quot; the analytics, because It won&#39;t display the correct info after migrating to 18.1, but you can still do it following this kb <a href="https://community.appian.com/support/w/kb/374/kb-1157-how-to-reset-the-analytics-engines-for-on-premise-installations-of-appian">community.appian.com/.../kb-1157-how-to-reset-the-analytics-engines-for-on-premise-installations-of-appian</a> .<br /> <br /> Yo can also recreate safely the search indices.<br /> <br /> Before doing this I recommend you to backup the installation first. It can take a bit to reset the analytics engines.<div style="clear:both;"></div>