SOLR-8542: Integrate Learning to Rank into Solr #4
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Solr Learning to Rank (LTR) provides a way for you to extract features
directly inside Solr for use in training a machine learned model. You
can then deploy that model to Solr and use it to rerank your top X
search results. This concept was previously presented by the authors at
Lucene/Solr Revolution 2015