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Re:ZGC – What's new in JDK 16 by manasvi_gupta on Tuesday March 23, 2021 @01:57PM (#26558016)
Please specify Elasticsearch & JDK version. Also, index size and heap size per node.

From my experience, high heap sizes are unnecessary since Lucene (used by ES) has greatly reduced heap usage by moving things off-heap[1].

[1] - https://www.elastic.co/blog/significantly-decrease-your-elas...

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