How can I multiply the score of two queries together in Elasticsearch?

Question

In Solr I can use the query function query to return a numerical score for a query and I can user that in the context of a bf parameter something l

Answer 1

You could script a TF*IDF scoring function using a function_score query. Something like this (ignoring Lucene's query and length normalization):

"script": "tf = _index[field][term].tf(); idf = (1 + log ( _index.numDocs() / (_index[field][term].df() + 1))); return sqrt(tf) * pow(idf,2)"

You'd take the product of those function results for 'cat' and 'dog' and add them to your original query score.

Here's the full query gist.