[DOC] Add Documentation for settings introduced in OpenSearch Github PR 12992

[Shubh Sahu]

What do you want to do?

• Request a change to existing documentation
• Add new documentation
• Report a technical problem with the documentation
• ~Other ~

Tell us about your request. Provide a summary of the request and all versions that are affected.
Add documentation for the remote backed cluster settings introduced as a part of OpenSearch PR : #12992

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.