[DOC] Documentation for adding aggregations support in hybrid query

[martin-gaievski]

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.
The team is enhancing the existing hybrid query clause by adding support for aggregations. Existing syntax for both hybrid query and aggregations will keep unchanged. Main change is on a backend, today hybrid query when used with aggregations will either fail or produce incorrect results.
We'd like to request change in a hybrid search section.

Functionality is aimed for 2.13 release.

What other resources are available?
RFC issue on github: opensearch-project/neural-search#604
Existing documentation for hybrid query search: https://opensearch.org/docs/latest/search-plugins/hybrid-search/
Existing documentation for aggs: https://opensearch.org/docs/latest/aggregations/

[hdhalter]

@martin-gaievski - Does this really need a documentation change if it is only a back-end fix? Maybe it just needs to be in the release notes?

[martin-gaievski]

@martin-gaievski - Does this really need a documentation change if it is only a back-end fix? Maybe it just needs to be in the release notes?

I think we need to add a statement to the documentation page stating that aggregations are fully supported in hybrid queries. Although there are no changes in the UI or API, this feature is highly demanded by customers. @vamshin what do you think, are release notes enough?

[vamshin]

@martin-gaievski Lets give example(s) on how to use aggregations with Hybrid query. This will be useful.

[hdhalter]

Sounds good. Who can make the change to https://github.com/opensearch-project/documentation-website/edit/main/_search-plugins/hybrid-search.md? Thanks!

[martin-gaievski]

Sounds good. Who can make the change to https://github.com/opensearch-project/documentation-website/edit/main/_search-plugins/hybrid-search.md? Thanks!

I've put together initial version of PR #6661