We are currently using ES 1.7. We have appropriate setting file where the no.of primary/replica shards count are read from and ES indices are created accordingly.
In one rare occurrence in our production, we found there was 1 index which was created with different primary/replica shards ,than what was mentioned in the setting(i couldn't repro it locally in my machine thou).
Is this any known issue? Could someone state the possibility or the reason why this might have happened?