Put mapping hanged on cluster and cluster is non-responsive

We are using Elasticsearch 5.6 and Java8.
We have updated the cluster with put mapping and few hours later the cluster stopped responding.
Only _cat/pending_tasks responding.
Somehow we can see multiple put-mapping events, and even if we kill it , process re-occurs again with different taskId.
All the data nodes are running with full utilization i.e 100% core utilized and there is not traffic on cluster.

Can anyone point to issue.
Found multiple cases but not solutions.

I would look to the nodes hot threads API to find out what the nodes are all doing. If this API is not responsive then you can use jstack on each node to grab the same information.

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