after upgrading cluster from 0.20.5 to 0.90.7 which went good , I'm
monitoring one issue which appeared: every day at exactly same time the CPU
load created by elasticsearch java process on all cluster nodes increases
from 2-3% to 90% for 15 minutes
it started exactly after upgrade
I checked periodic tasks, load from application, and other places:
- there are no cron jobs at that time
- the application activity is not high at that moment - the users's load
is even lower at that time
so all points to the fact that this was caused after upgrade
any thoughts on how to act further?
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