A Dtrace of the EVIndexAdminService on the EV server may show the following message.
(EVIndexAdminService) <34680> EV-L {VELOCITYINDEXINGENGINEERRORS.EN_US} Skipping report as an identical report has been processed recently. ID=LIBSQLITE_CRITICAL, Message=An error occurred while attempting to execute the SQL statement [] on the database [I:\EVIndex\IndexStorage\index7\134A544FD7AA10F4692D9AFD6B996C8F0_71\live\log.sq lt]: [database disk image is malformed]
V-437-41022
If the above error is seen the cause is a corruption in the index volume that will not allow updates to occur.
Verify that there are no disk related issues and antivirus exclusions are in place.
A rebuild of the index volume will be required to resolve the issue. Please refer to the documentation for more information.