Add documentation for settings introduced in 2.14

[ashking94]

Description

Adds description about multiple settings that have been introduced as part of remote store feature in 2.14 OpenSearch release.

Issues Resolved

Closes #6675

Checklist

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[hdhalter]

Thanks, @ashking94 ! Can you please resolve the Vale errors?

[ashking94]

@natebower @hdhalter Do approve and merge if there are no more comments. Thanks!

[natebower]

@natebower @hdhalter Do approve and merge if there are no more comments. Thanks!

@ashking94 This will still require doc and editorial reviews. I believe @hdhalter was just asking for the Vale errors to be resolved first.