vigyasharma opened a new pull request, #963:
URL: https://github.com/apache/lucene/pull/963

   In [LUCENE-10583](https://issues.apache.org/jira/browse/LUCENE-10583), our 
users ran into a deadlock for IndexWriter threads. This was because the 
application had acquired a lock on the MMapDirectory, which was preventing 
merge threads from cleaning up files and completing.
   
   The IndexWriter docstring does present a "Note", to use non-Lucene objects 
for locking, but no such warning was evident for the MMapDirectory. This PR is 
a small change to add a similar warning to MMapDirectory and Directory 
docstrings.
   


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