High cpu usage (90%-100%)

Elastic Stack Elasticsearch
1

we are going live with elasticsearch and as soon as we put production load
cpu spikes to 90-100%.. wondering whats causing the issue.

here is cluster info:
es version: 0.90.0
5 nodes each with following config:
64gb ram
ES_MIN_MEM = ES_MAX_MEM and set to 32gb
24 core

3 indices

  1. 5 shards, 4 Replicas
  2. 5 shards, 4 Replicas
  3. 2 shards, 4 replicas

total documents 5 million, and the total size of the indices = 45GB

attaching the the result of hotthreads command.

would appreciate your help on this.

Thanks.

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