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Elasticsearch Guide [7.7] » Query DSL » Term-level queries » Terms set query
« Terms query Type Query »

Terms set queryedit

Returns documents that contain a minimum number of exact terms in a provided field.

The terms_set query is the same as the terms query, except you can define the number of matching terms required to return a document. For example:

  • A field, programming_languages, contains a list of known programming languages, such as c++, java, or php for job candidates. You can use the terms_set query to return documents that match at least two of these languages.
  • A field, permissions, contains a list of possible user permissions for an application. You can use the terms_set query to return documents that match a subset of these permissions.

Example requestedit

Index setupedit

In most cases, you’ll need to include a numeric field mapping in your index to use the terms_set query. This numeric field contains the number of matching terms required to return a document.

To see how you can set up an index for the terms_set query, try the following example.

  1. Create an index, job-candidates, with the following field mappings:

    • name, a keyword field. This field contains the name of the job candidate.
    • programming_languages, a keyword field. This field contains programming languages known by the job candidate.
    • required_matches, a numeric long field. This field contains the number of matching terms required to return a document. 
    PUT /job-candidates
{
    "mappings": {
        "properties": {
            "name": {
                "type": "keyword"
            },
            "programming_languages": {
                "type": "keyword"
            },
            "required_matches": {
                "type": "long"
            }
        }
    }
}

  2. Index a document with an ID of 1 and the following values:

    • Jane Smith in the name field.
    • ["c++", "java"] in the programming_languages field.
    • 2 in the required_matches field.

    Include the ?refresh parameter so the document is immediately available for search.

    PUT /job-candidates/_doc/1?refresh
{
    "name": "Jane Smith",
    "programming_languages": ["c++", "java"],
    "required_matches": 2
}

  3. Index another document with an ID of 2 and the following values:

    • Jason Response in the name field.
    • ["java", "php"] in the programming_languages field.
    • 2 in the required_matches field. 
    PUT /job-candidates/_doc/2?refresh
{
    "name": "Jason Response",
    "programming_languages": ["java", "php"],
    "required_matches": 2
}

You can now use the required_matches field value as the number of matching terms required to return a document in the terms_set query.

Example queryedit

The following search returns documents where the programming_languages field contains at least two of the following terms:

  • c++
  • java
  • php

The minimum_should_match_field is required_matches. This means the number of matching terms required is 2, the value of the required_matches field.

GET /job-candidates/_search
{
    "query": {
        "terms_set": {
            "programming_languages": {
                "terms": ["c++", "java", "php"],
                "minimum_should_match_field": "required_matches"
            }
        }
    }
}

Top-level parameters for terms_setedit

<field>
(Required, object) Field you wish to search.

Parameters for <field>edit

terms

(Required, array of strings) Array of terms you wish to find in the provided <field>. To return a document, a required number of terms must exactly match the field values, including whitespace and capitalization.

The required number of matching terms is defined in the minimum_should_match_field or minimum_should_match_script parameter.

minimum_should_match_field
(Optional, string) Numeric field containing the number of matching terms required to return a document.
minimum_should_match_script

(Optional, string) Custom script containing the number of matching terms required to return a document.

For parameters and valid values, see Scripting.

For an example query using the minimum_should_match_script parameter, see How to use the minimum_should_match_script parameter.

Notesedit

How to use the minimum_should_match_script parameteredit

You can use minimum_should_match_script to define the required number of matching terms using a script. This is useful if you need to set the number of required terms dynamically.

Example query using minimum_should_match_scriptedit

The following search returns documents where the programming_languages field contains at least two of the following terms:

  • c++
  • java
  • php

The source parameter of this query indicates:

  • The required number of terms to match cannot exceed params.num_terms, the number of terms provided in the terms field.
  • The required number of terms to match is 2, the value of the required_matches field. 
GET /job-candidates/_search
{
    "query": {
        "terms_set": {
            "programming_languages": {
                "terms": ["c++", "java", "php"],
                "minimum_should_match_script": {
                   "source": "Math.min(params.num_terms, doc['required_matches'].value)"
                },
                "boost": 1.0
            }
        }
    }
}
« Terms query Type Query »