High query/indexing time one node (cpu ok)

I'm facing high query/indexing time for just one node.

  • My cluster has 8 nodes
  • My index has 5 primary shards and 3 replicas

I checked the shards using the _cat/shards api, and everything looks as expected.

The cpu is ok.

I already tried rebooting the node, but it just moves the problem to another one.

Any idea?

Elasticsearch version: 5.5.1

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