Elasticsearch node stats api showing high cpu when nodes are idle

We are observing high CPU usage in elastic cluster master node even when cluster is Idle.
We are using elasticsearch version 7.12

We are using cluster with 3 master nodes and 5 data nodes . All data nodes are having 36GB RAM each and master node is of 16GB

When we check the Kubernetes pods everything looks normal ......no high cpu ausage at all

Is there any chance elastic serach node stats api calculating wrong cpu usage ?

Thanks in advance

The CPU usage numbers come direct from the JDK which in turn gets them directly from the OS. However you're using a version which is well over 2 years old, long past EOL, and IIRC some older JDKs didn't always do the right thing when running in containers. I recommend you upgrade to a supported version.

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