[DOC]New cluster settings for keyword MultiTermQueries

[harshavamsi]

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.
We added new cluster settings that reverts the keyword field terms queries from using IndexOrDocValuesQuery
*Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.
2.17
What other resources are available? Provide links to related issues, POCs, steps for testing, etc.
opensearch-project/OpenSearch#15637