Elasticsearch read operations very high

Elastic Stack Elasticsearch
1

issue: our cluster is observing high read operations

elasticsearch version: elasticsearch-6.2.1
5 nodes each with 2 cpus and 7GB or ram
the data volume for elasticsearch uses a zfs pool mounted using an ssd drive and the scheduler for that drive is set to noop

here is the node stats
https://pastebin.com/ThgJjX5u

here is the hot threads
https://pastebin.com/7Rv2vzGa

21%20PM
Screen Shot 2018-12-14 at 1.42.21 PM.png3304×714 455 KB

i have also uploaded a diagram of the IO from a box and notice the avg reads per seconds is around 400.

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