[[index-patterns-runtime-field-api-create]]
=== Create runtime field API
++++
<titleabbrev>Create runtime field</titleabbrev>
++++

deprecated::[8.0.0,Use <<data-views-runtime-field-api-create>> instead.]

experimental[] Create a runtime field

[[index-patterns-runtime-field-create-request]]
==== Request

`POST <kibana host>:<port>/api/index_patterns/index_pattern/<index_pattern_id>/runtime_field`

`POST <kibana host>:<port>/s/<space_id>/api/index_patterns/index_pattern/<index_pattern_id>/runtime_field`

[[index-patterns-runtime-field-create-params]]
==== Path parameters

`space_id`::
(Optional, string) An identifier for the space. If `space_id` is not provided in the URL, the default space is used.

`index_pattern_id`::
(Required, string) The ID of the index pattern.

[[index-patterns-runtime-field-create-body]]
==== Request body

`name`:: (Required, string) The name for a runtime field.

`runtimeField`:: (Required, object) The runtime field definition object.


[[index-patterns-runtime-field-create-example]]
==== Examples

Create a runtime field on an index pattern:

[source,sh]
--------------------------------------------------
$ curl -X POST api/index_patterns/index_pattern/<index_pattern_id>/runtime_field
{
  "name": "runtimeFoo",
  "runtimeField": {
     "type": "long",
     "script": {
        "source": "emit(doc["foo"].value)"
      }
  }
}
--------------------------------------------------
// KIBANA

The API returns created runtime field object and update index pattern object:

[source,sh]
--------------------------------------------------
{
    "index_pattern": {...},
    "field": {...}
}
--------------------------------------------------