Error: “Content Index State Failed” when auditing mailbox access on Exchange 2013

This article provides detailed steps on how to eliminate the “Content Index State Failed” error.
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Symptoms When auditing mailbox access on Exchange 2013, you receive the following error:

"Cannot audit mailboxes stored in the AAA database on the BBB server. The “Content Index State Failed” error has occurred on your Exchange server." 
Cause Your Exchange server databases have unhealthy status—ContextIndexState:Failed
As a result, Netwrix Auditor cannot collect audit data about mailboxes with the Search-MailboxAuditLog cmdlet.

To determine the exact database that has failed indexes, run the following command:  Get-MailboxDatabaseCopyStatus.
See Microsoft documentation for more information.

 
Resolution

Rebuild failed indexes on your Exchange server side. See Microsoft article Reseed the search catalog for more information.

After fixing the failed indexes, restart data collection.
 
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