ChrisHegarty commented on PR #13570:
URL: https://github.com/apache/lucene/pull/13570#issuecomment-2233089190

   > Can someone take a stab at summarizing this for CHANGES.txt, thus avoiding 
details a reader is unlikely to know about? Like me :-). How will a user of 
Lucene benefit?
   
   ```
   * GITHUB#13570, GITHUB#13574, GITHUB#13535: Avoid performance degradation 
with closing shared Arenas. Index
   files are mmapped one-to-one with the JDK's foreign shared Arena. The JVM 
deoptimizes the top few frames of
   all threads when closing a shared Arena (see JDK-8335480). We mitigate this 
situation by 1) using a confined
   Arena where appropriate, and 2) grouping files from the same segment to a 
single shared Arena.
   ```


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