[7.x] [Docs] some basic searchsource api docs (#77038)#77263

Merged

ppisljar merged 1 commit intoelastic:7.xfrom ppisljar:backport/7.x/pr-77038

Sep 14, 2020

+2,544-143

Commits on Sep 11, 2020

[Docs] some basic searchsource api docs (elastic#77038 )
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