Upayavira created SOLR-5827:
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             Summary: Add boosting functionality to MoreLikeThisHandler
                 Key: SOLR-5827
                 URL: https://issues.apache.org/jira/browse/SOLR-5827
             Project: Solr
          Issue Type: Improvement
          Components: MoreLikeThis
            Reporter: Upayavira
             Fix For: 4.8


The MoreLikeThisHandler facilitates the creation of a very simple yet powerful 
recommendation engine. 

It is possible to constrain the result set using filter queries. However, it 
isn't possible to influence the scoring using function queries. Adding function 
query boosting would allow for including such things as recency in the 
relevancy calculations.

Unfortunately, the boost= parameter is already in use, meaning we cannot 
replicate the edismax boost/bf for additive/multiplicative boostings.

My patch only touches the MoreLikeThisHandler, so the only really contentious 
thing is to decide the parameters to configure it.

I have a prototype working, and will upload a patch shortly. 




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