Summary

Support result scoring based on combined results obtained from multiple search, vector-search and possibly non-search pipelines. 

Allow users to be able to use well known functions to combine scores (like listed here) or to define custom score composition functions.

Motivation

Users that have multiple search indexes (e.g. a regular search index and vector search index) may want to retrieve documents based on a score that depends on both vector distance and match quality to a regular search query.

We want to provide a reasonably efficient and convenient way of obtaining a combining results from multiple pipelines that return documents with their respective scores. 

Documentation

Product Description
Scope
Technical Design
Docs Update