[DOC] Search backpressure SearchTask cancellation documentation

[PritLadani]

What do you want to do?

• [X] 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. As a part of https://github.com/opensearch-project/OpenSearch/issues/5173, we have introduced SearchTask cancellation based on resource consumption. We need to update the public documentation to add the response when a query is cancelled due SearchTask cancellation.

What other resources are available? Provide links to related issues, POCs, steps for testing, etc. Issue link: https://github.com/opensearch-project/OpenSearch/issues/5173 PR: https://github.com/opensearch-project/OpenSearch/pull/5605 Current public doc: https://opensearch.org/docs/latest/opensearch/search-backpressure#search-backpressure-settings Previous doc update link: https://github.com/opensearch-project/documentation-website/issues/2629

[kolchfa-aws]

@PritLadani Could you specify what needs to be added please?

[PritLadani]

@kolchfa-aws I am waiting for this PR https://github.com/opensearch-project/OpenSearch/pull/6634 to get merged. Once that is done, we update the documentation. Will update the PR probably next week.