[role="xpack"]
[testenv="basic"]
[[put-transform]]
= Create {transform} API

[subs="attributes"]
++++
<titleabbrev>Create {transform}</titleabbrev>
++++

Instantiates a {transform}.

[[put-transform-request]]
== {api-request-title}

`PUT _transform/<transform_id>`

[[put-transform-prereqs]]
== {api-prereq-title}

If the {es} {security-features} are enabled, you must have the following
built-in roles and privileges:

* `transform_admin`
* source index: `read`, `view_index_metadata`
* destination index: `read`, `create_index`, `manage` and `index`

For more information, see <<built-in-roles>>, <<security-privileges>>, and
{ml-docs-setup-privileges}.


[[put-transform-desc]]
== {api-description-title}

This API defines a {transform}, which copies data from source indices,
transforms it, and persists it into an entity-centric destination index. If you 
choose to use the pivot method for your {transform}, the entities are defined by 
the set of `group_by` fields in the `pivot` object.  If you choose to use the 
latest method, the entities are defined by the `unique_key` field values in the 
`latest` object.

You can also think of the destination index as a two-dimensional tabular data structure (known as a {dataframe}). The ID for each document in the
{dataframe} is generated from a hash of the entity, so there is a unique row
per entity. For more information, see <<transforms>>.

When the {transform} is created, a series of validations occur to
ensure its success. For example, there is a check for the existence of the
source indices and a check that the destination index is not part of the source
index pattern. You can use the `defer_validation` parameter to skip these
checks.

Deferred validations are always run when the {transform} is started,
with the exception of privilege checks. When {es} {security-features} are
enabled, the {transform} remembers which roles the user that created
it had at the time of creation and uses those same roles. If those roles do not
have the required privileges on the source and destination indices, the
{transform} fails when it attempts unauthorized operations.

IMPORTANT: You must use {kib} or this API to create a {transform}. Do not put a 
{transform} directly into any `.transform-internal*` indices using the {es}
index API. If {es} {security-features} are enabled, do not give users any
privileges on `.transform-internal*` indices. If you used {transforms} prior to
7.5, also do not give users any privileges on `.data-frame-internal*` indices.
            
You must choose either the latest or pivot method for your {transform}; you
cannot use both in a single {transform}.

[[put-transform-path-parms]]
== {api-path-parms-title}

`<transform_id>`::
(Required, string)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-id]

[[put-transform-query-parms]]
== {api-query-parms-title}

`defer_validation`::
  (Optional, Boolean) When `true`, deferrable validations are not run. This
  behavior may be desired if the source index does not exist until after the
  {transform} is created.

[role="child_attributes"]
[[put-transform-request-body]]
== {api-request-body-title}

`description`::
  (Optional, string) Free text description of the {transform}.

//Begin dest
`dest`::
(Required, object)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=dest]
+
.Properties of `dest`
[%collapsible%open]
====

`index`:::
(Required, string)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=dest-index]

`pipeline`:::
(Optional, string)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=dest-pipeline]
====
//End dest

`frequency`::
(Optional, <<time-units, time units>>)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=frequency]

//Begin latest
`latest`::
(Required^*^, object)
beta:[]
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-latest]
+
.Properties of `latest`
[%collapsible%open]
====

`sort`:::
(Required, string)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-sort]

`unique_key`:::
(Required, array of strings)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-unique-key]

====
//End latest

//Begin pivot
`pivot`::
(Required^*^, object)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=pivot]
+
.Properties of `pivot`
[%collapsible%open]
====

`aggregations` or `aggs`:::
(Required, object)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=pivot-aggs]

`group_by`:::
(Required, object)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=pivot-group-by]

====
//End pivot

//Begin settings
`settings`::
(Optional, object)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings]
+
.Properties of `settings`
[%collapsible%open]
====
`dates_as_epoch_millis`:::
(Optional, boolean)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings-dates-as-epoch-milli]
`docs_per_second`:::
(Optional, float)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings-docs-per-second]
`max_page_search_size`:::
(Optional, integer)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=transform-settings-max-page-search-size]
====
//End settings

//Begin source
`source`::
(Required, object)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=source-transforms]
+
.Properties of `source`
[%collapsible%open]
====

`index`:::
(Required, string or array)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=source-index-transforms]

`query`:::
(Optional, object)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=source-query-transforms]
====
//End source

//Begin sync
`sync`::
(Optional, object)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=sync]
+
.Properties of `sync`
[%collapsible%open]
====

//Begin time
`time`:::
(Required, object)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=sync-time]
+
.Properties of `time`
[%collapsible%open]
=====

`delay`::::
(Optional, <<time-units, time units>>)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=sync-time-delay]

`field`::::
(Required, string)
include::{es-repo-dir}/rest-api/common-parms.asciidoc[tag=sync-time-field]
+
--
TIP: In general, it’s a good idea to use a field that contains the
<<accessing-ingest-metadata,ingest timestamp>>. If you use a different field,
you might need to set the `delay` such that it accounts for data transmission
delays.

--
=====
//End time
====
//End sync


[[put-transform-example]]
== {api-examples-title}

The following {transform} uses the `pivot` method:

[source,console]
--------------------------------------------------
PUT _transform/ecommerce_transform1
{
  "source": {
    "index": "kibana_sample_data_ecommerce",
    "query": {
      "term": {
        "geoip.continent_name": {
          "value": "Asia"
        }
      }
    }
  },
  "pivot": {
    "group_by": {
      "customer_id": {
        "terms": {
          "field": "customer_id"
        }
      }
    },
    "aggregations": {
      "max_price": {
        "max": {
          "field": "taxful_total_price"
        }
      }
    }
  },
  "description": "Maximum priced ecommerce data by customer_id in Asia",
  "dest": {
    "index": "kibana_sample_data_ecommerce_transform1",
    "pipeline": "add_timestamp_pipeline"
  },
  "frequency": "5m",
  "sync": {
    "time": {
      "field": "order_date",
      "delay": "60s"
    }
  }
}
--------------------------------------------------
// TEST[setup:kibana_sample_data_ecommerce,add_timestamp_pipeline]

When the {transform} is created, you receive the following results:

[source,console-result]
----
{
  "acknowledged" : true
}
----

The following {transform} uses the `latest` method: 

[source,console]
--------------------------------------------------
PUT _transform/ecommerce_transform2
{
  "source": {
    "index": "kibana_sample_data_ecommerce"
  },
  "latest": {
    "unique_key": ["customer_id"],
    "sort": "order_date"
  },
  "description": "Latest order for each customer",
  "dest": {
    "index": "kibana_sample_data_ecommerce_transform2"
  },
  "frequency": "5m",
  "sync": {
    "time": {
      "field": "order_date",
      "delay": "60s"
    }
  }
}
--------------------------------------------------
// TEST[setup:kibana_sample_data_ecommerce]