when optimize command is issued, the expectation after the completion of
optimization process is that the index size either decreases or at most remain
same. In solr 7.6 cluster with 50 plus shards, when optimize command is issued,
some of the shard's transient or older segment files are not deleted. This is
happening randomly across all shards. When unnoticed these transient files
makes disk full. Currently it is handled through monitors, but question is what
is causing the transient/older files remains there. Are there any specific race
conditions which laves the older files not being deleted?
Any pointers around this will be helpful.
TIA
