Node crash is happening ES 6.8

Because of some bad query GC clean up is happening more frequently and node is getting crashed after sometime.
Is there any way to know which query is causing the issues? Or how to prevent node is going down?
I read about Circuit breaker , but not sure which config will help to prevent node crash.
Thanks a lot for any inputs.

Cluster Settings:
Version - 6.8
16 core 64 GB with gc 24 GB.
13 nodes

Which version of Elasticsearch are you using? What is the specification of your cluster?

ES 6.8 .
Cluster config:
16 core 64 GB with 13 data nodes.

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