Update transform APIedit

Updates certain properties of a transform.


POST _transform/<transform_id>/_update


Requires the following privileges:

  • cluster: manage_transform (the transform_admin built-in role grants this privilege)
  • source indices: read, view_index_metadata
  • destination index: read, index. If a retention_policy is configured, delete index privilege is also required.


This API updates an existing transform. The list of properties that you can update is a subset of the list that you can define when you create a transform.

When the transform is updated, a series of validations occur to ensure its success. You can use the defer_validation parameter to skip these checks.

All updated properties except description do not take effect until after the transform starts the next checkpoint. This is so there is data consistency in each checkpoint.

  • Your transform remembers which roles the user who updated it had at the time of update and runs with those privileges. If you provide secondary authorization headers, those credentials are used instead.
  • You must use Kibana or this API to update a transform. Directly updating any transform internal, system, or hidden indices is not supported and may cause permanent failure.

Path parametersedit

(Required, string) Identifier for the transform.

Query parametersedit

(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 updated.
(Optional, time) Period to wait for a response. If no response is received before the timeout expires, the request fails and returns an error. Defaults to 30s.

Request bodyedit

(Optional, string) Free text description of the transform.

(Optional, object) The destination for the transform.

Properties of dest
(Required, string) The destination index for the transform.

In the case of a pivot transform, the mappings of the destination index are deduced based on the source fields when possible. If alternate mappings are required, use the Create index API prior to starting the transform.

In the case of a latest transform, the mappings are never deduced. If dynamic mappings for the destination index are undesirable, use the Create index API prior to starting the transform.

(Optional, array of objects) The aliases that the destination index for the transform should have. Aliases are manipulated using the stored credentials of the transform, which means the secondary credentials supplied at creation time (if both primary and secondary credentials are specified).

The destination index is added to the aliases regardless whether the destination index was created by the transform or pre-created by the user.

+ .Properties of aliases

(Required, string) The name of the alias.
(Optional, boolean) Whether or not the destination index should be the only index in this alias. If true, all the other indices will be removed from this alias before adding the destination index to this alias. Defaults to false.
(Optional, string) The unique identifier for an ingest pipeline.
(Optional, time units) The interval between checks for changes in the source indices when the transform is running continuously. The minimum value is 1s and the maximum is 1h. The default value is 1m.
(Optional, object) Defines optional transform metadata.

(Optional, object) Defines a retention policy for the transform. Data that meets the defined criteria is deleted from the destination index.

Properties of retention_policy

(Required, object) Specifies that the transform uses a time field to set the retention policy. Data is deleted if time.field for the retention policy exists and contains data older than max.age.

Properties of time
(Required, string) The date field that is used to calculate the age of the document. Set time.field to an existing date field.
(Required, time units) Specifies the maximum age of a document in the destination index. Documents that are older than the configured value are removed from the destination index.

(Optional, object) Defines optional transform settings.

Properties of settings
(Optional, boolean) Specifies whether the transform checkpoint ranges should be optimized for performance. Such optimization can align checkpoint ranges with date histogram interval when date histogram is specified as a group source in the transform config. As an effect, less document updates in the destination index will be performed thus improving overall performance. The default value is true, which means the checkpoint ranges will be optimized if possible.
(Optional, boolean) Defines if dates in the output should be written as ISO formatted string (default) or as millis since epoch. epoch_millis has been the default for transforms created before version 7.11. For compatible output set this to true. The default value is false.
(Optional, boolean) Specifies whether the transform should deduce the destination index mappings from the transform config. The default value is true, which means the destination index mappings will be deduced if possible.
(Optional, float) Specifies a limit on the number of input documents per second. This setting throttles the transform by adding a wait time between search requests. The default value is null, which disables throttling.
(Optional, integer) Defines the initial page size to use for the composite aggregation for each checkpoint. If circuit breaker exceptions occur, the page size is dynamically adjusted to a lower value. The minimum value is 10 and the maximum is 65,536. The default value is 500.
(Optional, integer) Defines the number of retries on a recoverable failure before the transform task is marked as failed. The minimum value is 0 and the maximum is 100. -1 can be used to denote infinity. In this case, the transform never gives up on retrying a recoverable failure. The default value is the cluster-level setting num_transform_failure_retries.
(Optional, boolean) If true, the transform runs in unattended mode. In unattended mode, the transform retries indefinitely in case of an error which means the transform never fails. Setting the number of retries other than infinite fails in validation. Defaults to false.

(Optional, object) The source of the data for the transform.

Properties of source

(Required, string or array) The source indices for the transform. It can be a single index, an index pattern (for example, "my-index-*"), an array of indices (for example, ["my-index-000001", "my-index-000002"]), or an array of index patterns (for example, ["my-index-*", "my-other-index-*"]. For remote indices use the syntax "remote_name:index_name".

If any indices are in remote clusters then the master node and at least one transform node must have the remote_cluster_client node role.

(Optional, object) A query clause that retrieves a subset of data from the source index. See Query DSL.

(Optional, object) Defines the properties transforms require to run continuously.

You can update these properties only if it is a continuous transform. You cannot change a batch transform into a continuous transform or vice versa. Instead, clone the transform in Kibana and add or remove the sync property.

Properties of sync

(Required, object) Specifies that the transform uses a time field to synchronize the source and destination indices.

Properties of time
(Optional, time units) The time delay between the current time and the latest input data time. The default value is 60s.

(Required, string) The date field that is used to identify new documents in the source.

In general, it’s a good idea to use a field that contains the ingest timestamp. If you use a different field, you might need to set the delay such that it accounts for data transmission delays.


response = client.transform.update_transform(
  transform_id: 'simple-kibana-ecomm-pivot',
  body: {
    source: {
      index: 'kibana_sample_data_ecommerce',
      query: {
        term: {
          'geoip.continent_name' => {
            value: 'Asia'
    description: 'Maximum priced ecommerce data by customer_id in Asia',
    dest: {
      index: 'kibana_sample_data_ecommerce_transform_v2',
      pipeline: 'add_timestamp_pipeline'
    frequency: '15m',
    sync: {
      time: {
        field: 'order_date',
        delay: '120s'
puts response
POST _transform/simple-kibana-ecomm-pivot/_update
  "source": {
    "index": "kibana_sample_data_ecommerce",
    "query": {
      "term": {
        "geoip.continent_name": {
          "value": "Asia"
  "description": "Maximum priced ecommerce data by customer_id in Asia",
  "dest": {
    "index": "kibana_sample_data_ecommerce_transform_v2",
    "pipeline": "add_timestamp_pipeline"
  "frequency": "15m",
  "sync": {
    "time": {
      "field": "order_date",
      "delay": "120s"

When the transform is updated, you receive the updated configuration:

  "id" : "simple-kibana-ecomm-pivot",
  "authorization" : {
    "roles" : [
  "version" : "8.4.0",
  "create_time" : 1656113450613,
  "source" : {
    "index" : [
    "query" : {
      "term" : {
        "geoip.continent_name" : {
          "value" : "Asia"
  "dest" : {
    "index" : "kibana_sample_data_ecommerce_transform_v2",
    "pipeline" : "add_timestamp_pipeline"
  "frequency" : "15m",
  "sync" : {
    "time" : {
      "field" : "order_date",
      "delay" : "120s"
  "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",
  "settings" : { }