Boosting by popularity, or script_score in elasticsearch query

[dioscuroi]

Issue Type:
enhancement

Platform:
Web

Description:
Is there a way to use the "script_score" feature in the elasticsearch query to boost search results by popularity? The reference can be found here. Thanks!

https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-function-score-query.html#function-script-score

Reactivesearch version: 2.7.0

[dioscuroi]

I solved the problem by using the "customQuery" field. Below is my code.

<DataSearch
  componentId="searchbar"
  autosuggest={true}
  showClear={true}
  autoFocus
  customQuery={
    function(value, props) {
      return {
        function_score: {
          query: {
            match: { name: value }
          },
          script_score : {
            script : {
              source: "Math.log(2 + doc['popularity'].value)"
            }
          }
        }
      }
    }
  }
/>

[siddharthlatest]

We can also support this at the library level. DataSearch and CategorySearch components can have a prop called popularityField (which has to have a Numeric mapping). When present and valid, the query is transformed to a function_score type query.

Instead of a script_score function, we will support the field_value_factor function.

{
    "query": {
        "function_score": {
            "query": { ... original query ...},   // this is the query the component was generating so far.
            "field_value_factor": {
                "field": "likes",   // this is the user specified popularity field
                "modifier": "log1p",// this smoothens the score (read more: https://www.elastic.co/guide/en/elasticsearch/guide/current/boosting-by-popularity.html#_modifier)
                "missing": 1        // when field has missing value, treat this as default value.
            }
        }
    }
}

As @dioscuroi shared in the above example, a user can always override this behavior by specifying a customQuery, but this gives a very quick way to add custom popularity (and allows to support the popularity use-case via a GUI in Dejavu, appbase.io dashboard, etc.)

[dioscuroi]

Yes, it will be awesome if popularity is supported at the library level. Thank you for adding it to the milestone. Please keep me updated when it is done! 😁