What is search thread_pool?

(Hamid Bayat) #1

I have some question about thread_pool.
on _cat/thread_pool , when there is some "search thread_pool rejected" on a node, what exactly missing in the search? some shards? or some doc? or fetch phase? or request?
where is thread_pool's queue memory? on HEAP?
is there any retry for rejected search?

(system) #2

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