ES cluster queries are slow suddenly


We have azure elastic search cluster with 9 VMs, created around 2 months
back, since then our application has been using this. There are around
eight index created, with five shards each. Suddenly today all the queries
became slow, when run those queries on marvel it takes long time. There
nothing we changed here. I have uploaded the _nodes/stats result on below

We have done all what we could, looked into all API where i could find some
lead. Please help us out here, and guide where to look?



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