[7.13] [DOCS] Document how to switch ILM policies (#73967)#74633

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jrodewig merged 1 commit intoelastic:7.13from jrodewig:backport/7.13/pr-73967

Jun 28, 2021

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Commits on Jun 28, 2021

[DOCS] Document how to switch ILM policies (#73967 )
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