Is your feature request related to a problem? Please describe

OpenSearch currently supports configuring size based thresholds for flush (reference). This does not apply to pull-based ingestion as translog is not used. Instead, add a new time based flush policy to commit the batchStartPointer periodically.

Describe the solution you'd like

Add a time-based flush policy, persisting fresh batchStartPointer in the commit. This should ensure replica recovery does not have to replay too many messages and prevent offset out-of-bounds after exceeding retention period.

Related component

Indexing

Describe alternatives you've considered

No response

Additional context

No response