Keyword field type

A keyword field type contains a string that is not analyzed. It allows only exact, case-sensitive matches.

If you need to use a field for full-text search, map it as text instead.

Example

Create a mapping with a keyword field:

  1. PUT movies
  2. {
  3. "mappings" : {
  4. "properties" : {
  5. "genre" : {
  6. "type" : "keyword"
  7. }
  8. }
  9. }
  10. }

copy

Parameters

The following table lists the parameters accepted by keyword field types. All parameters are optional.

ParameterDescription
boostA 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_valuesA 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.
eager_global_ordinalsSpecifies whether global ordinals should be loaded eagerly on refresh. If the field is often used for aggregations, this parameter should be set to true. Default is false.
fieldsTo index the same string in several ways (for example, as a keyword and text), provide the fields parameter. You can specify one version of the field to be used for search and another to be used for sorting and aggregations.
ignore_aboveAny string longer than this integer value should not be indexed. Default is 2147483647. Default dynamic mapping creates a keyword subfield for which ignore_above is set to 256.
indexA Boolean value that specifies whether the field should be searchable. Default is true.
index_optionsInformation to be stored in the index that will be considered when calculating relevance scores. Can be set to freqs for term frequency. Default is docs.
metaAccepts metadata for this field.
normalizerSpecifies how to preprocess this field before indexing (for example, make it lowercase). Default is null (no preprocessing).
normsA Boolean value that specifies whether the field length should be used when calculating relevance scores. Default is false.
null_valueA 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.
similarityThe ranking algorithm for calculating relevance scores. Default is BM25.
split_queries_on_whitespaceA Boolean value that specifies whether full-text queries should be split on whitespace. Default is false.
storeA Boolean value that specifies whether the field value should be stored and can be retrieved separately from the _source field. Default is false.

Keyword - 图1