[DOC] Add documentation related to allocator time out

[imRishN]

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.
Relevant PR - opensearch-project/OpenSearch#15239

*Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.

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

[Naarcha-AWS]

@imRishN: Is this related to 2.17?

[imRishN]

@Naarcha-AWS yes

[dblock]

[Catch All Triage - 1, 2, 3, 4, 5]