Hi,

How can we normalize BM25 scores by the query length (number of tokens) in
Lucene or elasticsearch? I can access document fields by scripting or lucene
expressions in elasticsearch
(https://www.elastic.co/guide/en/elasticsearch/reference/master/modules-scripting-expression.html)
but I could not find a way to get number of query tokens inside a script. So
do I have to write my custom Lucene/elasticsearch query for this? Is there
any other possible way?

thanks
rifat





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