Support restricting vector search to index shards

[smdsbz]

Search before asking

• I searched in the issues and found nothing similar.

Motivation

Support restricting vector search to a specific set of index shards.

Solution

No response

Anything else?

No response

Willingness to contribute

• I'm willing to submit a PR!

[KHARSHAVARDHAN-eng]

@smdsbz , Hi, I’d be interested in working on this. I’d like to investigate the current vector-search path and add optional shard-level filtering while preserving existing behavior, with appropriate tests. Happy to investigate and submit a PR.