We are experiencing an unbalance on our cluster, and after some manual shard reallocation, we saw that there was no disk space freed at the time.
After a quick check on the logs, we saw that lucene failed to acquire a lock:
org.apache.lucene.store.LockObtainFailedException: Can't lock shard
I found another thread following the same problem, but without any response and how to proceed:
We are experiencing exactly the same issue: how to proceed to remove such files safely?
Thanks in advance,