Apply different boosting values when searching for phrase in Elasticsearch?

Question

I want to search for a phrase to Elasticsearch like "personal tax date". I want the returned results to give more weight to the term "tax".

So far I know how to boost entire index or boost for different fields but still don't know how to boost different terms? Any help??

Answer 1

Using function score we can boost by fields

GET <index_name>/_search
{
    "query": {
        "function_score": {
           "query": {
            "query_string": {
               "query": "*personal tax date*",
               "fields": [
                "field_1",
                "field_2"
               ]
            }
            },
            "boost": "5",
               "functions": [
                          {
                  "filter": { "match": { "field": "tax" } },
                  "weight": 30
              },
              {
                  "filter": { "term": { "ent_name": "tax" } },
                  "weight": 25
              }
          ],
             "score_mode": "multiply",
            "boost_mode": "sum"
        }
    }

Answer 2

You can use query_string query and boost the term using query string syntax as below:

{
  "query": {
    "query_string": {
      "query": "personal tax^2 date"
    }
  }
}