Dr Oleg Savrasov commented on SOLR-13500:

At first glance this looks like duplicate of 

> Vector Search with Solr
> -----------------------
>                 Key: SOLR-13500
>                 URL: https://issues.apache.org/jira/browse/SOLR-13500
>             Project: Solr
>          Issue Type: New Feature
>            Reporter: Dr Oleg Savrasov
>            Priority: Major
> In machine learning problems we usually need to find nearest neighbors in 
> dense high dimensional vector space. Often, this retrieval had to be 
> augmented with traditional Boolean retrieval.
> While no efficient KNN implementation is available in Solr yet, in practice 
> people are using brute-force vector distance sorting after Boolean retrieval 
> limits number of candidate vectors.
> It's proposed to add a clear way to implement such a solution with Solr.

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