NOTE: You are looking at documentation for an older release. For the latest information, see the current release documentation.

« Metric aggregation reduce context Bucket selector aggregation context »

› ›

Bucket script aggregation context

edit

Bucket script aggregation context

edit

Use a Painless script in an bucket_script pipeline aggregation to calculate a value as a result in a bucket.

Variables

edit

params (Map, read-only): User-defined parameters passed in as part of the query. The parameters include values defined as part of the buckets_path.

Return

edit

numeric: The calculated value as the result.

API

edit

The standard Painless API is available.

Example

edit

To run this example, first follow the steps in context examples.

The painless context in a bucket_script aggregation provides a params map. This map contains both user-specified custom values, as well as the values from other aggregations specified in the buckets_path property.

This example takes the values from a min and max aggregation, calculates the difference, and adds the user-specified base_cost to the result:

(params.max - params.min) + params.base_cost

Note that the values are extracted from the params map. In context, the aggregation looks like this:

GET /seats/_search
{
  "size": 0,
  "aggs": {
    "theatres": {
      "terms": {
        "field": "theatre",
        "size": 10
      },
      "aggs": {
        "min_cost": {
          "min": {
            "field": "cost"
          }
        },
        "max_cost": {
          "max": {
            "field": "cost"
          }
        },
        "spread_plus_base": {
          "bucket_script": {
            "buckets_path": { 
              "min": "min_cost",
              "max": "max_cost"
            },
            "script": {
              "params": {
                "base_cost": 5 
              },
              "source": "(params.max - params.min) + params.base_cost"
            }
          }
        }
      }
    }
  }
}

	The `buckets_path` points to two aggregations (`min_cost`, `max_cost`) and adds `min`/`max` variables to the `params` map
	The user-specified `base_cost` is also added to the script’s `params` map

« Metric aggregation reduce context Bucket selector aggregation context »