Elasticsearch: combine function scores

I'm scoring es query with three functions:

{   "query": {     "function_score": {       "query": {         "bool": {           ...         }       }     }   },   "score_mode": "multiply",   "boost_mode": "replace",   "functions": [     { f1 },     { f2 },     { f3 }   ] } 

so the score would be: f1(doc) * f2(doc) * f3(doc).

But what I want is f1(doc) * f2(doc) + f3(doc), any solutions?

2 Answers

Answers 1

This might work, i.e. we multiply the scores of functions f1 and f2 together and then we add that score to the query score which is another function_score query just for f3.

{   "query": {     "function_score": {       "query": {         "function_score": {           "query": { "match_all": {}},           "functions": [             {               "f3": {...}             }           ]         }       },       "functions": [         {           "f1": {...}         },         {           "f2": {...}         }       ],       "score_mode": "multiply",       "boost_mode": "sum"     }   } } 

Answers 2

there is a sum option for the score mode

"score_mode": "sum",

this should allow you to sum the scores.

see f.e. https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-function-score-query.html

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