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Elastic Docs ›Elasticsearch Guide [7.16] ›REST APIs ›Machine learning anomaly detection APIs

Forecast jobs API

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Forecast jobs API

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Predicts the future behavior of a time series by using its historical behavior.

Request

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POST _ml/anomaly_detectors/<job_id>/_forecast

Prerequisites

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Requires the manage_ml cluster privilege. This privilege is included in the machine_learning_admin built-in role.

Description

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You can create a forecast job based on an anomaly detection job to extrapolate future behavior. Refer to Forecasting the future and forecast limitations to learn more.

You can delete a forecast by using the Delete forecast API.

  • Forecasts are not supported for jobs that perform population analysis; an error occurs if you try to create a forecast for a job that has an over_field_name property in its configuration.
  • The job must be open when you create a forecast. Otherwise, an error occurs.

Path parameters

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<job_id>
(Required, string) Identifier for the anomaly detection job.

Query parameters

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duration
(Optional, time units) A period of time that indicates how far into the future to forecast. For example, 30d corresponds to 30 days. The default value is 1 day. The forecast starts at the last record that was processed.
expires_in
(Optional, time units) The period of time that forecast results are retained. After a forecast expires, the results are deleted. The default value is 14 days. If set to a value of 0, the forecast is never automatically deleted.
max_model_memory
(Optional, byte value) The maximum memory the forecast can use. If the forecast needs to use more than the provided amount, it will spool to disk. Default is 20mb, maximum is 500mb and minimum is 1mb. If set to 40% or more of the job’s configured memory limit, it is automatically reduced to below that amount.

Request body

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You can also specify the query parameters (such as duration and expires_in) in the request body.

Examples

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POST _ml/anomaly_detectors/total-requests/_forecast
{
  "duration": "10d"
}

When the forecast is created, you receive the following results:

{
  "acknowledged": true,
  "forecast_id": "wkCWa2IB2lF8nSE_TzZo"
}

You can subsequently see the forecast in the Single Metric Viewer in Kibana.

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