mikemccand commented on issue #15068:
URL: https://github.com/apache/lucene/issues/15068#issuecomment-3191317050

   > Maybe setting 
`-Dorg.apache.lucene.store.MMapDirectory.sharedArenaMaxPermits` to a smallish 
value (defaults to 1024) would work too, not sure.
   
   I tested `-Dorg.apache.lucene.store.MMapDirectory.sharedArenaMaxPermits=1` 
and it does indeed prevent the leak with my small test case on 9.12.x, JDK 21:
   
   ```
   MAP COUNT (from /proc/234634/maps): 508 [0 si files]
   MAP COUNT (from /proc/234634/maps): 508 [0 si files]
   MAP COUNT (from /proc/234634/maps): 508 [0 si files]
   MAP COUNT (from /proc/234634/maps): 508 [0 si files]
   MAP COUNT (from /proc/234634/maps): 508 [0 si files]
   MAP COUNT (from /proc/234634/maps): 508 [0 si files]
   MAP COUNT (from /proc/234634/maps): 508 [0 si files]
   MAP COUNT (from /proc/234634/maps): 508 [0 si files]
   ```


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