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Token count field type

Introduced 1.0

A token count field type stores the number of analyzed tokens in a string.

Example

Create a mapping with a token count field:

PUT testindex
{
  "mappings": {
    "properties": {
      "sentence": { 
        "type": "text",
        "fields": {
          "num_words": { 
            "type":     "token_count",
            "analyzer": "english"
          }
        }
      }
    }
  }
}

Index three documents with text fields:

PUT testindex/_doc/1
{ "sentence": "To be, or not to be: that is the question." }


PUT testindex/_doc/2
{ "sentence": "All the world’s a stage, and all the men and women are merely players." }


PUT testindex/_doc/3
{ "sentence": "Now is the winter of our discontent." }

Search for sentences with fewer than 10 words:

GET testindex/_search
{
  "query": {
    "range": {
      "sentence.num_words": {
        "lt": 10
      }
    }
  }
}

The response contains one matching sentence:

{
  "took" : 8,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 1.0,
    "hits" : [
      {
        "_index" : "testindex",
        "_type" : "_doc",
        "_id" : "3",
        "_score" : 1.0,
        "_source" : {
          "sentence" : "Now is the winter of our discontent."
        }
      }
    ]
  }
}

Parameters

The following table lists the parameters accepted by token count field types. The analyzer parameter is required; all other parameters are optional.

Parameter Description
analyzer The analyzer to be used for this field. Specify an analyzer without token filters for optimal performance. Required.
boost A floating-point value that specifies the weight of this field toward the relevance score. Values above 1.0 increase the field’s relevance. Values between 0.0 and 1.0 decrease the field’s relevance. Default is 1.0.
doc_values A Boolean value that specifies whether the field should be stored on disk so that it can be used for aggregations, sorting, or scripting. Default is false.
enable_position_increments A Boolean value that specifies whether position increments should be counted. To avoid removing stopwords, set this field to false. Default is true.
index A Boolean value that specifies whether the field should be searchable. Default is true.
null_value A value to be used in place of null. Must be of the same type as the field. If this parameter is not specified, the field is treated as missing when its value is null. Default is null.
store A Boolean value that specifies whether the field value should be stored and can be retrieved separately from the _source field. Default is false.
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