KNN score multipliers

[timscullin]

It would be great if we could add a multiplier based on other fields to the knn score for vector search.

We've built a little prototype here which allows a user to search by audience for products:
https://twitter.com/timscullin/status/1782619381589315905

This uses an embedding for the product audience description for the vector search.

It's pretty good but I think we could get better results if we were able to use the products popularity score to increase it's ranking.

A poorly thought out example of how you could achieve this:

{
  'q': 'chair',
  'query_by' : 'embedding',
  'boost' : 'popularity:1,sales:2'
}

In this case it would multiple the embedding knn score by 1x popularity and 2x the sales.

Thanks for all the great work!