[[ml-get-category]]
==== Get Categories

The get categories API allows you to retrieve information about the categories in the results for a job.

===== Request

`GET _xpack/ml/anomaly_detectors/<job_id>/results/categories` +

`GET _xpack/ml/anomaly_detectors/<job_id>/results/categories/<category_id>`
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===== Description

////
===== Path Parameters

`job_id`::
  (+string+) Identifier for the job.

`category_id`::
  (+string+) Identifier for the category. If you do not specify this optional parameter,
  the API returns information about all categories that you have authority to view.

===== Request Body

//TBD: Test these properties, since they didn't work on older build.

`from`::
  (+integer+) Skips the specified number of categories.

`size`::
  (+integer+) Specifies the maximum number of categories to obtain.

===== Results

The API returns the following information:

`categories`::
    (+array+) An array of category objects. For more information, see
    <<ml-results-categories,Categories>>.
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===== Responses

200
(EmptyResponse) The cluster has been successfully deleted
404
(BasicFailedReply) The cluster specified by {cluster_id} cannot be found (code: clusters.cluster_not_found)
412
(BasicFailedReply) The Elasticsearch cluster has not been shutdown yet (code: clusters.cluster_plan_state_error)
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===== Examples

The following example gets category information for the `it_ops_new_logs` job:

[source,js]
--------------------------------------------------
GET _xpack/ml/anomaly_detectors/it_ops_new_logs/results/categories
--------------------------------------------------
// CONSOLE
// TEST[skip:todo]

In this example, the API returns the following information for each category:
----
{
  "count": 11,
  "categories": [
    {
      "job_id": "it_ops_new_logs",
      "category_id": 1,
      "terms": "Actual Transaction Already Voided Reversed hostname
      dbserver.acme.com physicalhost esxserver1.acme.com vmhost app1.acme.com",
      "regex": ".*?Actual.+?Transaction.+?Already.+?Voided.+?Reversed.+?hostname.
      +?dbserver.acme.com.+?physicalhost.+?esxserver1.acme.com.+?vmhost.
      +?app1.acme.com.*",
      "max_matching_length": 137,
      "examples": [
        "Actual Transaction Already Voided / Reversed;hostname=dbserver.acme.com;
        physicalhost=esxserver1.acme.com;vmhost=app1.acme.com"
      ]
    },
  ...
  ]
}
----