Casting Types

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Casting explicitly converts a value from one data type to another during indexing, as long as the types are compatible. It is the indexing-side counterpart of Casting Values, which does the same at search time.

A cast is written as an object whose single key is the target type. For example, given an integer field, a value that arrives as a float can be cast so it is stored and indexed as an integer:

PUT /test_casting_types/

{
  "_schema": {
    "total": {
      "_type": "integer"
    }
  }
}

PUT /test_casting_types/1

{
  "total": {
    "_integer": 2221.82
  }
}

The float 2221.82 is cast to the integer 2221, so the document matches an integer query:

SEARCH /test_casting_types/

{
  "_query": {
    "total": 2221
  }
}

See Casting Values for the full table of compatible types.