[8.19] Bypass MMap arena grouping as this has caused issues with too many regions being mapped (#135012) #135130
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…gions being mapped (elastic#135012) There is a JDK issue where closing sharedArenas from many threads can significantly harm performance. This ref-counting of shared arenas was designed as a way to get around this performance issue. However, we have noticed a significant increase in leaks and issues with mmap regions since this change. https://bugs.openjdk.org/browse/JDK-8335480 should have helped the performance impact of closing shared arenas (though possibly not fully mitigated it). I am proposing we turn off the grouping as it appears (at least to me), not worth it. I am willing to backdown if we thing other fixes should be done. I also suggest this gets backported to 9.1, 8.19, and is merged into 9.2 (cherry picked from commit 2672cd0)
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