I recently deployed a new logging cluster on Kibana / ES 6.2.4
My old cluster was on 2.4
Performance on the new cluster is terribly slow. Queries that the 2.4 cluster is returning in a matter of 3-5 seconds are taking > 30 seconds (which is the default timeout) on my 6.2 cluster.
I am wondering if there are any major gotchas that I haven't considered while upgrading from 2.4 to 6.
In the browser, I see the _msearch network request either 502 or get cancelled.
It is using http/1.1 and no SSL. But my understanding is that ES doesn't support http/2, so would having an http/2 proxy in front of it yield performance improvements?
This is on a new cluster, it's receiving fresh data from fluent / td-agent -- I never tried to do a data dump from ES 2.4 to 6.2
Any help would be appreciated, I understand this is a bit vague of a description, I'm happy to provide more information!
This is running in Ubuntu 16.04, 3 node ES cluster, 1 instance for Kibana. ES is proxied behind an AWS ELB.