OpenSearch/docs/reference/data-frames/apis/preview-data-frame-transfor...

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[role="xpack"]
[testenv="basic"]
[[preview-data-frame-transform]]
=== Preview {dataframe-transforms} API
++++
<titleabbrev>Preview {dataframe-transforms}</titleabbrev>
++++
Previews a {dataframe-transform}.
==== Request
`POST _data_frame/transforms/_preview`
//==== Description
//==== Path Parameters
//==== Authorization
==== Request Body
`source`:: The source index or index pattern.
`pivot`:: Defines the pivot function `group by` fields and the aggregation to
reduce the data.
==== Examples
The following example obtains a preview of a {dataframe-transform} on the {kib}
eCommerce sample data:
[source,js]
--------------------------------------------------
POST _data_frame/transforms/_preview
{
"source": "kibana_sample_data_ecommerce",
"pivot": {
"group_by": {
"customer_id": {
"terms": {
"field": "customer_id"
}
}
},
"aggregations": {
"max_price": {
"max": {
"field": "taxful_total_price"
}
}
}
}
}
--------------------------------------------------
// CONSOLE
// TEST[skip:set up sample data]
The data that is returned for this example is as follows:
[source,js]
----
{
"preview" : [
{
"max_price" : 171.0,
"customer_id" : "10"
},
{
"max_price" : 233.0,
"customer_id" : "11"
},
{
"max_price" : 200.0,
"customer_id" : "12"
}
...
]
}
----
// NOTCONSOLE