Index migration runs on every job after Exchange DAG backupset upgrade

For MS Exchange DAG mail level backup set created by AhsayOBM version 6, after upgrading the client application to version 7.3.2.0 - 7.5.0.2, index migration is performed on every backup jobs.

The following informative messages are received in the Backup Job Logs during index migration:

[YYYY/MM/DD hh:mm:ss] [info] [100] Migrating index entry Job="Current" Path="Microsoft Exchange" Type="T" from v6 to v7
[YYYY/MM/DD hh:mm:ss] [cbs] [100] info,"Migrating index entry Job=\"Current\" Path=\"Microsoft Exchange\" Type=\"T\" from v6 to v7",0,0,0,,
...
[YYYY/MM/DD hh:mm:ss] [info] [100] Saving encrypted backup file index to backupset_id/blocks at destination CBS...
[YYYY/MM/DD hh:mm:ss] [info] [100] Saving encrypted backup file index to backupset_id/blocks/YYYY-MM-DD-hh-mm-ss at destination CBS...
...
[YYYY/MM/DD hh:mm:ss] [info] [100] Marking this v6 destination as index migrated to server ...
[YYYY/MM/DD hh:mm:ss] [cbs] [100] info,Marking this v6 destination as index migrated to server ...,0,0,0,,