[jira] [Created] (SOLR-16246) Implement pre-filtering functionallity for KnnQParser

["Elia Porciani (Jira)" <ji...@apache.org>]

Elia Porciani created SOLR-16246:
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             Summary: Implement pre-filtering functionallity for KnnQParser
                 Key: SOLR-16246
                 URL: https://issues.apache.org/jira/browse/SOLR-16246
             Project: Solr
          Issue Type: Task
      Security Level: Public (Default Security Level. Issues are Public)
            Reporter: Elia Porciani


At the current state of development, with KnnQParser it is possible to specify filter queries and the result is the intersection between:
* top-K document founds by the KNN search
* Results of the filter query
As a consequence, if the filter query filters out some documents in the top-K results, we will have less than K results in the result set.

The proposal is to leverage the recent Apache Lucene development [LUCENE-10382|https://issues.apache.org/jira/browse/LUCENE-10382] to change the behavior of the filter queries in the KnnQParser in such a way:
* The filter query works as pre-filtering
* KNN Search retrieves the top-K results among the documents that are not filtered out.




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