Thanks for your response.

None of the processes are deleting any index files.
One data directory is only pointed by one core.

We are writing data at a high ingestion rate (100,000 records per second).
Commit happens once every 30 seconds.

Also a periodic service runs to backup the data to our backup data store.
This service starts by saving commit point & when its done, it released the
commit point.

Could this combination of these factors some how cause the deletion of
files?

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