[7.x] [DOCS] Reformat split index API docs (#46713)#47578

Merged

jrodewig merged 1 commit intoelastic:7.xfrom jrodewig:backport/7.x/pr-46713

Oct 4, 2019

+98-50

Commits on Oct 4, 2019

[DOCS] Reformat split index API docs (#46713 )
jrodewig
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