Since I've upraged ELK from 2.3.3 to 5.0.1, when I make a search request in Kibana, it is very low.
I try to figure out why.
In my elasticsearch configuration, I have these inputs:
thread_pool: search: size: 13 queue_size: 12000
When I try to see some old visualization I get this warning (there is a connection ? ):
Courier Fetch: 140 of 620 shards failed.
If you have any advice regarding this performance issue, please let me know.