[7.3][DOCS] Separate and reformat synced flush API docs (#46634)#46841

Merged

jrodewig merged 1 commit intoelastic:7.3from jrodewig:backport/7.3/pr-46634

Sep 19, 2019

+295-195

Commits on Sep 18, 2019

[DOCS] Separate and reformat synced flush API docs (#46634 )
jrodewig
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