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cat fielddata API

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cat fielddata API

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Returns the amount of heap memory currently used by the field data cache on every data node in the cluster.

Request

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GET /_cat/fielddata/<field>

GET /_cat/fielddata

Prerequisites

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If the Elasticsearch security features are enabled, you must have the monitor or manage cluster privilege to use this API.

Path parameters

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<field>: (Optional, string) Comma-separated list of fields used to limit returned information.

Query parameters

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bytes: (Optional, byte size units) Unit used to display byte values.
format: (Optional, string) Short version of the HTTP accept header. Valid values include JSON, YAML, etc.
h: (Optional, string) Comma-separated list of column names to display.
help: (Optional, Boolean) If true, the response includes help information. Defaults to false.
s: (Optional, string) Comma-separated list of column names or column aliases used to sort the response.
v: (Optional, Boolean) If true, the response includes column headings. Defaults to false.

Examples

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Example with an individual field

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You can specify an individual field in the request body or URL path. The following fieldata API request retrieves heap memory size information for the body field.

GET /_cat/fielddata?v=true&fields=body

The API returns the following response:

id                     host      ip        node    field   size
Nqk-6inXQq-OxUfOUI8jNQ 127.0.0.1 127.0.0.1 Nqk-6in body    544b

Example with a list of fields

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You can specify a comma-separated list of fields in the request body or URL path. The following fieldata API request retrieves heap memory size information for the body and soul fields.

GET /_cat/fielddata/body,soul?v=true

The API returns the following response:

id                     host      ip        node    field   size
Nqk-6inXQq-OxUfOUI8jNQ 127.0.0.1 127.0.0.1 Nqk-6in body    544b
Nqk-6inXQq-OxUfOUI8jNQ 127.0.0.1 127.0.0.1 Nqk-6in soul    480b

The response shows the individual fielddata for the body and soul fields, one row per field per node.

Example with all fields in a cluster

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The following fieldata API request retrieves heap memory size information all fields.

GET /_cat/fielddata?v=true

The API returns the following response:

id                     host      ip        node    field   size
Nqk-6inXQq-OxUfOUI8jNQ 127.0.0.1 127.0.0.1 Nqk-6in body    544b
Nqk-6inXQq-OxUfOUI8jNQ 127.0.0.1 127.0.0.1 Nqk-6in mind    360b
Nqk-6inXQq-OxUfOUI8jNQ 127.0.0.1 127.0.0.1 Nqk-6in soul    480b

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