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.