Whether rrf can be applied to nested knn search using inner hits

[shwanlee]

Does rrf apply to queries that combine keyword search, sparse vector search, and knn vector search using inner hits?

[iulia (Iulia Feroli)]

Hi!

At the moment on the official docs it says the current (technical preview) supports the following types of searches:

RRF does support:

• sub searches
• aggregations
• from

You can use RRF as part of a search to combine and rank documents using result sets from a combination of query, sub searches, and/or knn searches. A minimum of 2 results sets is required for ranking from the specified sources.

Check the docs for examples.

The capabilities may change and evolve until it reaches GA - you can test it out; any unsupported features included in the query will result in an exception.