High Memory usage after migrating from Transport Client to Rest Client

Elastic Stack Elasticsearch
1

Hello,

After migrating from Transport Client to Rest Client we discoverd some nodes in the Elasticsearch cluster had high memory usage and these nodes was not responding to cat/nodes request.

I'm running Eclipse memory analyzer to analyze the hprof dump :

截屏2023-08-30 下午5.29.48
截屏2023-08-30 下午5.29.48750×734 60.4 KB

截屏2023-08-30 下午5.28.37
截屏2023-08-30 下午5.28.371568×1840 290 KB

截屏2023-08-30 下午5.28.21
截屏2023-08-30 下午5.28.212374×1388 319 KB

Elasticsearch version:7.9.1
java version:1.8
total heap space size:32GB

Any help would be greatly appreciated.

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