[[reference-cat-fielddata]]

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||        ██████╗ ███████╗ █████╗ ██████╗ ███╗   ███╗███████╗                                                            ||
||        ██╔══██╗██╔════╝██╔══██╗██╔══██╗████╗ ████║██╔════╝                                                            ||
||        ██████╔╝█████╗  ███████║██║  ██║██╔████╔██║█████╗                                                              ||
||        ██╔══██╗██╔══╝  ██╔══██║██║  ██║██║╚██╔╝██║██╔══╝                                                              ||
||        ██║  ██║███████╗██║  ██║██████╔╝██║ ╚═╝ ██║███████╗                                                            ||
||        ╚═╝  ╚═╝╚══════╝╚═╝  ╚═╝╚═════╝ ╚═╝     ╚═╝╚══════╝                                                            ||
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||    This file is autogenerated, DO NOT send pull requests that changes this file directly.                             ||
||    You should update the script that does the generation, which can be found in:                                      ||
||    https://github.com/elastic/elastic-client-generator-js                                                             ||
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||    You can run the script with the following command:                                                                 ||
||       npm run elasticsearch -- --version <version>                                                                    ||
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////////

[discrete]
=== client.cat.fielddata

Returns the amount of heap memory currently used by the field data cache on every data node in the cluster. IMPORTANT: cat APIs are only intended for human consumption using the command line or Kibana console. They are not intended for use by applications. For application consumption, use the nodes stats API.

{ref}/cat-fielddata.html[{es} documentation]

[discrete]
==== Function signature

[source,ts]
----
(CatFielddataRequest, options?): Promise<CatFielddataResponse>
----

[discrete]
===== `CatFielddataRequest`

[source,ts]
----
interface CatFielddataRequest extends CatCatRequestBase {
  fields?: <<shared-type-fields, Fields>>
  bytes?: <<shared-type-bytes, Bytes>>
}
----

[discrete]
===== `CatFielddataResponse`

[source,ts]
----
type CatFielddataResponse = CatFielddataFielddataRecord[]
----

