CPU for one of the nodes is high frequently


I have an elastic cluster running with 8 data nodes 2 client nodes and 3 master nodes. I frequently observe that CPU of one of the nodes(slightly random though) increases above 70% and keeps it to that level unless I restart the node.
During this time response time increases drastically. Everything comes to normal as soon as I restart.

I am facing problems in troubleshooting this. Could someone please suggest any pointers?
Could there be routing problem from client node?

I am running 2.3.5 version and have almost equal configuration for all the data nodes(m4.2xlarge).


first please update your Elasticsearch version if possible. This one was released more than a year ago.

You can use the hot_threads API to find out where CPU time is spent.


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