//lcawley: Verified example output 2017-04-11
[[ml-preview-datafeed]]
==== Preview {dfeeds-cap}

The preview {dfeed} API enables you to preview a {dfeed}.


===== Request

`GET _xpack/ml/datafeeds/<datafeed_id>/_preview`


===== Description

The API returns the first "page" of results from the `search` that is created
by using the current {dfeed} settings. This preview shows the structure of
the data that will be passed to the anomaly detection engine.


===== Path Parameters

`datafeed_id` (required)::
  (string) Identifier for the {dfeed}


===== Authorization

You must have `monitor_ml`, `monitor`, `manage_ml`, or `manage` cluster
privileges to use this API. For more information, see <<privileges-list-cluster>>.


===== Examples

The following example obtains a preview of the `datafeed-farequote` {dfeed}:

[source,js]
--------------------------------------------------
GET _xpack/ml/datafeeds/datafeed-farequote/_preview
--------------------------------------------------
// CONSOLE
// TEST[skip:todo]

The data that is returned for this example is as follows:
[source,js]
----
[
  {
    "@timestamp": 1454803200000,
    "airline": "AAL",
    "responsetime": 132.20460510253906
  },
  {
    "@timestamp": 1454803200000,
    "airline": "JZA",
    "responsetime": 990.4628295898438
  },
  {
    "@timestamp": 1454803200000,
    "airline": "JBU",
    "responsetime": 877.5927124023438
  },
  ...
]
----
