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Transforms APIs

Aside from using OpenSearch Dashboards, you can also use the REST API to create, start, stop, and complete other operations relative to transform jobs.

Table of contents

Create a transform job

Introduced 1.0

Creates a transform job.

Sample Request

PUT _plugins/_transform/<transform_id>

{
  "transform": {
  "enabled": true,
  "continuous": true,
  "schedule": {
    "interval": {
    "period": 1,
    "unit": "Minutes",
    "start_time": 1602100553
    }
  },
  "description": "Sample transform job",
  "source_index": "sample_index",
  "target_index": "sample_target",
  "data_selection_query": {
    "match_all": {}
  },
  "page_size": 1,
  "groups": [
    {
    "terms": {
      "source_field": "customer_gender",
      "target_field": "gender"
    }
    },
    {
    "terms": {
      "source_field": "day_of_week",
      "target_field": "day"
    }
    }
  ],
  "aggregations": {
    "quantity": {
    "sum": {
      "field": "total_quantity"
    }
    }
  }
  }
}

Sample Response

{
  "_id": "sample",
  "_version": 7,
  "_seq_no": 13,
  "_primary_term": 1,
  "transform": {
    "transform_id": "sample",
    "schema_version": 7,
    "continuous": true,
    "schedule": {
      "interval": {
        "start_time": 1621467964243,
        "period": 1,
        "unit": "Minutes"
      }
    },
    "metadata_id": null,
    "updated_at": 1621467964243,
    "enabled": true,
    "enabled_at": 1621467964243,
    "description": "Sample transform job",
    "source_index": "sample_index",
    "data_selection_query": {
      "match_all": {
        "boost": 1.0
      }
    },
    "target_index": "sample_target",
    "roles": [],
    "page_size": 1,
    "groups": [
      {
        "terms": {
          "source_field": "customer_gender",
          "target_field": "gender"
        }
      },
      {
        "terms": {
          "source_field": "day_of_week",
          "target_field": "day"
        }
      }
    ],
    "aggregations": {
      "quantity": {
        "sum": {
          "field": "total_quantity"
        }
      }
    }
  }
}

You can specify the following options in the HTTP request body:

Option Data Type Description Required
enabled Boolean If true, the transform job is enabled at creation. No
continuous Boolean Specifies whether the transform job should be continuous. Continuous jobs execute every time they are scheduled according to the schedule field and run based off of newly transformed buckets, as well as any new data added to source indexes. Non-continuous jobs execute only once. Default is false. No
schedule Object The schedule the transform job runs on. Yes
start_time Integer The Unix epoch time of the transform job’s start time. Yes
description String Describes the transform job. No
metadata_id String Any metadata to be associated with the transform job. No
source_index String The source index whose data to transform. Yes
target_index String The target index the newly transformed data is added into. You can create a new index or update an existing one. Yes
data_selection_query Object The query DSL to use to filter a subset of the source index for the transform job. See query DSL for more information. Yes
page_size Integer The number of buckets IM processes and indexes concurrently. Higher number means better performance but requires more memory. If your machine runs out of memory, IM automatically adjusts this field and retries until the operation succeeds. Yes
groups Array Specifies the grouping(s) to use in the transform job. Supported groups are terms, histogram, and date_histogram. For more information, see Bucket Aggregations. Yes if not using aggregations
source_field String The field(s) to transform Yes
aggregations Object The aggregations to use in the transform job. Supported aggregations are: sum, max, min, value_count, avg, scripted_metric, and percentiles. For more information, see Metric Aggregations. Yes if not using groups

Update a transform job

Introduced 1.0

Updates a transform job if transform_id already exists.

Sample Request

PUT _plugins/_transform/<transform_id>

{
  "transform": {
  "enabled": true,
  "schedule": {
    "interval": {
    "period": 1,
    "unit": "Minutes",
    "start_time": 1602100553
    }
  },
  "description": "Sample transform job",
  "source_index": "sample_index",
  "target_index": "sample_target",
  "data_selection_query": {
    "match_all": {}
  },
  "page_size": 1,
  "groups": [
    {
    "terms": {
      "source_field": "customer_gender",
      "target_field": "gender"
    }
    },
    {
    "terms": {
      "source_field": "day_of_week",
      "target_field": "day"
    }
    }
  ],
  "aggregations": {
    "quantity": {
    "sum": {
      "field": "total_quantity"
    }
    }
  }
  }
}

Sample Response

{
  "_id": "sample",
  "_version": 2,
  "_seq_no": 14,
  "_primary_term": 1,
  "transform": {
    "transform_id": "sample",
    "schema_version": 7,
    "schedule": {
      "interval": {
        "start_time": 1602100553,
        "period": 1,
        "unit": "Minutes"
      }
    },
    "metadata_id": null,
    "updated_at": 1621889843874,
    "enabled": true,
    "enabled_at": 1621889843874,
    "description": "Sample transform job",
    "source_index": "sample_index",
    "data_selection_query": {
      "match_all": {
        "boost": 1.0
      }
    },
    "target_index": "sample_target",
    "roles": [],
    "page_size": 1,
    "groups": [
      {
        "terms": {
          "source_field": "customer_gender",
          "target_field": "gender"
        }
      },
      {
        "terms": {
          "source_field": "day_of_week",
          "target_field": "day"
        }
      }
    ],
    "aggregations": {
      "quantity": {
        "sum": {
          "field": "total_quantity"
        }
      }
    }
  }
}

The Update operation supports the following URL parameters:

Parameter Description Required
if_seq_no Only perform the transform operation if the last operation that changed the transform job has the specified sequence number. Yes
if_primary_term Only perform the transform operation if the last operation that changed the transform job has the specified sequence term. Yes

You can update the following fields:

Option Data Type Description
schedule Object The schedule the transform job runs on. Contains the fields interval.start_time, interval.period, and interval.unit.
start_time Integer The Unix epoch start time of the transform job.
period Integer How often to execute the transform job.
unit String The unit of time associated with the execution period. Available options are Minutes, Hours, and Days.
description Integer Describes the transform job.
page_size Integer The number of buckets IM processes and indexes concurrently. Higher number means better performance but requires more memory. If your machine runs out of memory, IM automatically adjusts this field and retries until the operation succeeds.

Get a transform job’s details

Introduced 1.0

Returns a transform job’s details.

Sample Request

GET _plugins/_transform/<transform_id>

Sample Response

{
  "_id": "sample",
  "_version": 7,
  "_seq_no": 13,
  "_primary_term": 1,
  "transform": {
    "transform_id": "sample",
    "schema_version": 7,
    "continuous": true,
    "schedule": {
      "interval": {
        "start_time": 1621467964243,
        "period": 1,
        "unit": "Minutes"
      }
    },
    "metadata_id": null,
    "updated_at": 1621467964243,
    "enabled": true,
    "enabled_at": 1621467964243,
    "description": "Sample transform job",
    "source_index": "sample_index",
    "data_selection_query": {
      "match_all": {
        "boost": 1.0
      }
    },
    "target_index": "sample_target",
    "roles": [],
    "page_size": 1,
    "groups": [
      {
        "terms": {
          "source_field": "customer_gender",
          "target_field": "gender"
        }
      },
      {
        "terms": {
          "source_field": "day_of_week",
          "target_field": "day"
        }
      }
    ],
    "aggregations": {
      "quantity": {
        "sum": {
          "field": "total_quantity"
        }
      }
    }
  }
}

You can also get details of all transform jobs by omitting transform_id.

Sample Request

GET _plugins/_transform/

Sample Response

{
  "total_transforms": 1,
  "transforms": [
    {
      "_id": "sample",
      "_seq_no": 13,
      "_primary_term": 1,
      "transform": {
        "transform_id": "sample",
        "schema_version": 7,
        "continuous": true,
        "schedule": {
          "interval": {
            "start_time": 1621467964243,
            "period": 1,
            "unit": "Minutes"
          }
        },
        "metadata_id": null,
        "updated_at": 1621467964243,
        "enabled": true,
        "enabled_at": 1621467964243,
        "description": "Sample transform job",
        "source_index": "sample_index",
        "data_selection_query": {
          "match_all": {
            "boost": 1.0
          }
        },
        "target_index": "sample_target",
        "roles": [],
        "page_size": 1,
        "groups": [
          {
            "terms": {
              "source_field": "customer_gender",
              "target_field": "gender"
            }
          },
          {
            "terms": {
              "source_field": "day_of_week",
              "target_field": "day"
            }
          }
        ],
        "aggregations": {
          "quantity": {
            "sum": {
              "field": "total_quantity"
            }
          }
        }
      }
    }
  ]
}

You can specify these options as the GET API operation’s URL parameters to filter results:

Parameter Description Required
from The starting index to search from. Default is 0. No
size Specifies the amount of results to return. Default is 10. No
search The search term to use to filter results. No
sortField The field to sort results with. No
sortDirection Specifies the direction to sort results in. Can be ASC or DESC. Default is ASC. No

For example, this request returns two results starting from the eighth index.

Sample Request

GET _plugins/_transform?size=2&from=8

Sample Response

{
  "total_transforms": 18,
  "transforms": [
    {
      "_id": "sample8",
      "_seq_no": 93,
      "_primary_term": 1,
      "transform": {
        "transform_id": "sample8",
        "schema_version": 7,
        "schedule": {
          "interval": {
            "start_time": 1622063596812,
            "period": 1,
            "unit": "Minutes"
          }
        },
        "metadata_id": "y4hFAB2ZURQ2dzY7BAMxWA",
        "updated_at": 1622063657233,
        "enabled": false,
        "enabled_at": null,
        "description": "Sample transform job",
        "source_index": "sample_index3",
        "data_selection_query": {
          "match_all": {
            "boost": 1.0
          }
        },
        "target_index": "sample_target3",
        "roles": [],
        "page_size": 1,
        "groups": [
          {
            "terms": {
              "source_field": "customer_gender",
              "target_field": "gender"
            }
          },
          {
            "terms": {
              "source_field": "day_of_week",
              "target_field": "day"
            }
          }
        ],
        "aggregations": {
          "quantity": {
            "sum": {
              "field": "total_quantity"
            }
          }
        }
      }
    },
    {
      "_id": "sample9",
      "_seq_no": 98,
      "_primary_term": 1,
      "transform": {
        "transform_id": "sample9",
        "schema_version": 7,
        "schedule": {
          "interval": {
            "start_time": 1622063598065,
            "period": 1,
            "unit": "Minutes"
          }
        },
        "metadata_id": "x8tCIiYMTE3veSbIJkit5A",
        "updated_at": 1622063658388,
        "enabled": false,
        "enabled_at": null,
        "description": "Sample transform job",
        "source_index": "sample_index4",
        "data_selection_query": {
          "match_all": {
            "boost": 1.0
          }
        },
        "target_index": "sample_target4",
        "roles": [],
        "page_size": 1,
        "groups": [
          {
            "terms": {
              "source_field": "customer_gender",
              "target_field": "gender"
            }
          },
          {
            "terms": {
              "source_field": "day_of_week",
              "target_field": "day"
            }
          }
        ],
        "aggregations": {
          "quantity": {
            "sum": {
              "field": "total_quantity"
            }
          }
        }
      }
    }
  ]
}

Start a transform job

Introduced 1.0

Transform jobs created using the API are automatically enabled, but if you ever need to enable a job, you can use the start API operation.

Sample Request

POST _plugins/_transform/<transform_id>/_start

Sample Response

{
  "acknowledged": true
}

Stop a transform job

Introduced 1.0

Stops/disables a transform job.

Sample Request

POST _plugins/_transform/<transform_id>/_stop

Sample Response

{
  "acknowledged": true
}

Get the status of a transform job

Introduced 1.0

Returns the status and metadata of a transform job.

Sample Request

GET _plugins/_transform/<transform_id>/_explain

Sample Response

{
  "sample": {
    "metadata_id": "PzmjweME5xbgkenl9UpsYw",
    "transform_metadata": {
      "continuous_stats": {
        "last_timestamp": 1621883525672,
        "documents_behind": {
          "sample_index": 72
          }
      },
      "transform_id": "sample",
      "last_updated_at": 1621883525873,
      "status": "finished",
      "failure_reason": "null",
      "stats": {
        "pages_processed": 0,
        "documents_processed": 0,
        "documents_indexed": 0,
        "index_time_in_millis": 0,
        "search_time_in_millis": 0
      }
    }
  }
}

Preview a transform job’s results

Introduced 1.0

Returns a preview of what a transformed index would look like.

Sample Request

POST _plugins/_transform/_preview

{
  "transform": {
  "enabled": false,
  "schedule": {
    "interval": {
    "period": 1,
    "unit": "Minutes",
    "start_time": 1602100553
    }
  },
  "description": "test transform",
  "source_index": "sample_index",
  "target_index": "sample_target",
  "data_selection_query": {
    "match_all": {}
  },
  "page_size": 10,
  "groups": [
    {
    "terms": {
      "source_field": "customer_gender",
      "target_field": "gender"
    }
    },
    {
    "terms": {
      "source_field": "day_of_week",
      "target_field": "day"
    }
    }
  ],
  "aggregations": {
    "quantity": {
    "sum": {
      "field": "total_quantity"
    }
    }
  }
  }
}

Sample Response

{
  "documents" : [
  {
    "quantity" : 862.0,
    "gender" : "FEMALE",
    "day" : "Friday"
  },
  {
    "quantity" : 682.0,
    "gender" : "FEMALE",
    "day" : "Monday"
  },
  {
    "quantity" : 772.0,
    "gender" : "FEMALE",
    "day" : "Saturday"
  },
  {
    "quantity" : 669.0,
    "gender" : "FEMALE",
    "day" : "Sunday"
  },
  {
    "quantity" : 887.0,
    "gender" : "FEMALE",
    "day" : "Thursday"
  }
  ]
}

Delete a transform job

Introduced 1.0

Deletes a transform job. This operation does not delete the source or target indexes.

Sample Request

DELETE _plugins/_transform/<transform_id>

Sample Response

{
  "took": 205,
  "errors": false,
  "items": [
    {
      "delete": {
        "_index": ".opensearch-ism-config",
        "_type": "_doc",
        "_id": "sample",
        "_version": 4,
        "result": "deleted",
        "forced_refresh": true,
        "_shards": {
          "total": 2,
          "successful": 1,
          "failed": 0
        },
        "_seq_no": 6,
        "_primary_term": 1,
        "status": 200
      }
    }
  ]
}