msfroh opened a new pull request, #13201:
URL: https://github.com/apache/lucene/pull/13201

   
   
   ### Description
   
   The existing cost estimate for multi-term queries was taking the worst-case 
scenario (e.g the query matches every term in the field), to provide an upper 
bound on the cost.
   
   In cases where the MultiTermQuery matches a small number of terms, we can 
provide a tighter estimate by summing the doc frequencies over those terms.
   


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