Elasticsearch 2.4.x shard data not removed from disk

Elastic Stack Elasticsearch
1

Hi,

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,

Best

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