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Preview transforms API

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Preview transforms API

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Previews a transform.

This functionality is in beta and is subject to change. The design and code is less mature than official GA features and is being provided as-is with no warranties. Beta features are not subject to the support SLA of official GA features.

Request

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POST _data_frame/transforms/_preview

Prerequisites

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If the Elasticsearch security features are enabled, you must have manage_data_frame_transforms cluster privileges to use this API. The built-in data_frame_transforms_admin role has these privileges. You must also have read and view_index_metadata privileges on the source index for the transform. For more information, see Security privileges and Built-in roles.

Description

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This API generates a preview of the results that you will get when you run the create transforms API with the same configuration. It returns a maximum of 100 results. The calculations are based on all the current data in the source index.

Request body

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source

(Required, object) The source configuration, which has the following properties:

index: (Required, string or array) The source indices for the transform. It can be a single index, an index pattern (for example, "myindex*"), or an array of indices (for example, ["index1", "index2"]).
query: (Optional, object) A query clause that retrieves a subset of data from the source index. See Query DSL.

pivot

(object) Required. Defines the pivot function group by fields and the aggregation to reduce the data. See Pivot objects.

Response body

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preview: (array) An array of documents. In particular, they are the JSON representation of the documents that would be created in the destination index by the transform.

Examples

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POST _data_frame/transforms/_preview
{
  "source": {
    "index": "kibana_sample_data_ecommerce"
  },
  "pivot": {
    "group_by": {
      "customer_id": {
        "terms": {
          "field": "customer_id"
        }
      }
    },
    "aggregations": {
      "max_price": {
        "max": {
          "field": "taxful_total_price"
        }
      }
    }
  }
}

The data that is returned for this example is as follows:

{
  "preview" : [
    {
      "max_price" : 171.0,
      "customer_id" : "10"
    },
    {
      "max_price" : 233.0,
      "customer_id" : "11"
    },
    {
      "max_price" : 200.0,
      "customer_id" : "12"
    }
    ...
  ]
}

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