[BUG] Segment_N file cleanup not happening on replicas for indexes with segrep using remote store replication

[ashking94]

Describe the bug
Observed this issue on replica shards where the segment_N file is not getting removed even after the commits (flushes).

To Reproduce
Create index with segment replication using remote store replication. Index docs, refresh, & then flush. On the primary, the segment_N+1 would appear and segment_N would be deleted, but on replica both segment_N and segment_N+1 file shows up. If you repeat the (Index docs, refresh, & then flush), then more and more segment_N files shows up on replica.

Expected behavior
There should be only 1 segment_N file in steady state.

Plugins
Standard

Screenshots
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Host/Environment (please complete the following information):

• OS: [e.g. iOS]
• Version [e.g. 22]

Additional context
Add any other context about the problem here.

[Poojita-Raj]

This is happening due to changes introduced by #8050 which removes replica commits and as a side-effect the cleanup of these files as part of the commit process is being skipped.

[mch2]

This will be fixed with #9111