I've seen a few cases of "everything" slow down. Like this:
[image: Elasticsearch cluster eqiad es_query_time]
I mean, we don't have the most even service times at the moment, but woah!
I don't see anything in Elasticsearch's primary logs. The slow logs
abound. They show that things that should have taken a handful of
milliseconds spike to ~8 seconds. Whatever causes it just stops after a
minute or so and we get back to normal service times.
It looks like most of the disruption was mostly to one index but the extra
load slowed down other unrelated requests. I think. I've tried to tie
this to other things. It doesn't look like it corresponds to a merge or a
recovering shard or anything.
Any ideas what this is? Any ideas of what to turn up in the log file to
find out more?
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