[7.7] [DOCS] Relocate thread pools content (#55814)#57434

Merged

jrodewig merged 1 commit intoelastic:7.7from jrodewig:backport__55814-77

Jun 1, 2020

+15-31

Commits on Jun 1, 2020

[DOCS] Relocate thread pools content (#55814 )

jrodewig
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