[7.7] [DOCS] Document index alias swaps are atomic (#55418)#57211

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jrodewig merged 1 commit intoelastic:7.7from jrodewig:backport__55418-77

May 27, 2020

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Commits on May 27, 2020

[DOCS] Document index alias swaps are atomic (#55418 )

jrodewig
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tugberkugurlu
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