Shutdown *JIRA* instance
Delete the contents of {{JIRA Installation Directory\work}} directory
Delete contents of the {{JIRA Home Directory\caches\indexes\changes}} directory
Delete contents of the {{JIRA Home Directory\caches\indexes\comments}} directory
Delete contents of the {{JIRA Home Directory\caches\indexes\entities}} directory
Delete contents of the {{JIRA Home Directory\caches\indexes\issues}} directory
Remove the content of the following directory:
<JIRA_HOME>/plugins/.bundled-plugins
<JIRA_HOME>/plugins/.osgi-plugins
Restart *JIRA* instance.
Perform re-indexing
Perform the integrity checker.