Why not auto release the memory

I use the _bulk interfaces concurrent writes 10M stress test, but after
the memory footprint has been stubbornly high, unless I restart the
elasticsearch.

How to make JVM automatically frees memory.

bigdesk screenshot

https://lh3.googleusercontent.com/-mdCKBVgQwTk/Ux_LRAs_zVI/AAAAAAAAAT4/xHMZHC4lCqo/s1600/Bigdesk.png

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