You're viewing version 2.13 of the OpenSearch documentation. This version is no longer maintained. For the latest version, see the current documentation. For information about OpenSearch version maintenance, see Release Schedule and Maintenance Policy.

Terms query

Use the terms query to search for multiple terms in the same field. For example, the following query searches for lines with the IDs 61809 and 61810:

GET shakespeare/_search
{
  "query": {
    "terms": {
      "line_id": [
        "61809",
        "61810"
      ]
    }
  }
}

A document is returned if it matches any of the terms in the array.

By default, the maximum number of terms allowed in a terms query is 65,536. To change the maximum number of terms, update the index.max_terms_count setting.

The ability to highlight results for terms queries may not be guaranteed, depending on the highlighter type and the number of terms in the query.

Parameters

The query accepts the following parameters. All parameters are optional.

Terms lookup

Terms lookup retrieves the field values of a single document and uses them as search terms. You can use terms lookup to search for a large number of terms.

To use terms lookup, you must enable the _source mapping field because terms lookup fetches values from a document. The _source field is enabled by default.

Terms lookup tries to fetch the document field values from a shard on a local data node. Thus, using an index with a single primary shard that has full replicas on all applicable data nodes reduces network traffic.

Example

As an example, create an index that contains student data, mapping student_id as a keyword:

PUT students
{
  "mappings": {
    "properties": {
      "student_id": { "type": "keyword" }
    }
  }
}

Next, index three documents that correspond to students:

PUT students/_doc/1
{
  "name": "Jane Doe",
  "student_id" : "111"
}

PUT students/_doc/2
{
  "name": "Mary Major",
  "student_id" : "222"
}

PUT students/_doc/3
{
  "name": "John Doe",
  "student_id" : "333"
}

Create a separate index that contains class information, including the class name and an array of student IDs corresponding to the students enrolled in the class:

PUT classes/_doc/101
{
  "name": "CS101",
  "enrolled" : ["111" , "222"]
}

To search for students enrolled in the CS101 class, specify the document ID of the document that corresponds to the class, the index of that document, and the path of the field in which the terms are located:

GET students/_search
{
  "query": {
    "terms": {
      "student_id": {
        "index": "classes",
        "id": "101",
        "path": "enrolled"
      }
    }
  }
}

The response contains the documents in the students index for every student whose ID matches one of the values in the enrolled array:

{
  "took": 13,
  "timed_out": false,
  "_shards": {
    "total": 1,
    "successful": 1,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": {
      "value": 2,
      "relation": "eq"
    },
    "max_score": 1,
    "hits": [
      {
        "_index": "students",
        "_id": "1",
        "_score": 1,
        "_source": {
          "name": "Jane Doe",
          "student_id": "111"
        }
      },
      {
        "_index": "students",
        "_id": "2",
        "_score": 1,
        "_source": {
          "name": "Mary Major",
          "student_id": "222"
        }
      }
    ]
  }
}

Example: Nested fields

The second example demonstrates querying nested fields. Consider an index with the following document:

PUT classes/_doc/102
{
  "name": "CS102",
  "enrolled_students" : {
    "id_list" : ["111" , "333"]
  }
}

To search for students enrolled in CS102, use the dot path notation to specify the full path to the field in the path parameter:

ET students/_search
{
  "query": {
    "terms": {
      "student_id": {
        "index": "classes",
        "id": "102",
        "path": "enrolled_students.id_list"
      }
    }
  }
}

The response contains the matching documents:

{
  "took": 18,
  "timed_out": false,
  "_shards": {
    "total": 1,
    "successful": 1,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": {
      "value": 2,
      "relation": "eq"
    },
    "max_score": 1,
    "hits": [
      {
        "_index": "students",
        "_id": "1",
        "_score": 1,
        "_source": {
          "name": "Jane Doe",
          "student_id": "111"
        }
      },
      {
        "_index": "students",
        "_id": "3",
        "_score": 1,
        "_source": {
          "name": "John Doe",
          "student_id": "333"
        }
      }
    ]
  }
}

Parameters

The following table lists the terms lookup parameters.