Run multi-vectors kNN search

Elastic Stack Elasticsearch
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Hello everyone!
I’m really interested by the new kNN search functionality of Elasticsearch v8.

Is there any way to run an approximate kNN search on multiple dense_vectors?

I checked the docs but, as of version 8.1.0, there’s no mention about it. Moreover, I tried to create a multi-vector query and execute it through Kibana dev tools console but it doesn’t seem to be supported.

Thank you so much,
Riccardo

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What do you mean by run an approximate kNN search on multiple dense_vectors?

If you mean that can a single field have multiple vectors, it is currently not supported.

Also providing multiple query vectors is not supported. But what you can do instead is to issue multiple _knn_search requests with each own query_vector and combine results on your application side.

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You can follow this development, which was not (yet) released. I think it may provide you the capability you are seeking. It is related to issue #91187 and PR #92118 and as you can see it is merged for v8.7 (note, this is not a commitment that it will be released then or at all, but we work transparently and you can draw your own conclusions).

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