[8.x] Adds maxSim functions for multi_dense_vector fields (#116993)
#117203
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This adds `maxSim` functions, specifically dotProduct and InvHamming. Why these two you might ask? Well, they are the best approximations of whats possible with Col* late interaction type models. Effectively, you want a similarity metric where "greater == better". Regular `hamming` isn't exactly that, but inverting that (just like our `element_type: bit` index for dense_vectors), is a nice approximation with bit vectors and multi-vector scoring. Then, of course, dotProduct is another usage. We will allow dot-product between like elements (bytes -> bytes, floats -> floats) and of course, allow `floats -> bit`, where the stored `bit` elements are applied as a "mask" over the float queries. This allows for some nice asymmetric interactions. This is all behind a feature flag, and I need to write a mountain of docs in a separate PR.
benwtrent
added
:Search Relevance/Vectors
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Backports the following commits to 8.x:
maxSimfunctions for multi_dense_vector fields (AddsmaxSimfunctions for multi_dense_vector fields #116993)