(ElasticSearch) REDUCING SCORING IMPACT WITH QUERY RESCORING

In some cases, however, scoring can be more resource-intensive:

• Scoring with a script runs a script to calculate the score for each document in the index
• Doing a phrase query searches for words within a certain distance from each other, with a large slop

To address this, elasticsearch use rescoring

POST get-together/_search?pretty

{

  "query" : {

    "match" : {

      "title" : "elasticsearch"

    }

  },

  "rescore" : {

    "window_size" : 20,

    "query" : {

      "rescore_query" : {

        "match" : {

          "title" : {

            "type" : "phrase",

            "query" : "elasticsearch hadoop",

            "slop" : 5

          }

        }

      },

      "query_weight" : 0.8,

      "rescore_query_weight" : 1.3

    }

  }

}

"window_size" means Number of results to be rescore

this situations is only 20