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Elasticsearch Reference [5.1] » Aggregations » Pipeline Aggregations » Avg Bucket Aggregation
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Avg Bucket Aggregationedit

Warning

This functionality is experimental and may be changed or removed completely in a future release.

A sibling pipeline aggregation which calculates the (mean) average value of a specified metric in a sibling aggregation. The specified metric must be numeric and the sibling aggregation must be a multi-bucket aggregation.

Syntaxedit

An avg_bucket aggregation looks like this in isolation:

{
    "avg_bucket": {
        "buckets_path": "the_sum"
    }
}

Table 1. avg_bucket Parameters

Parameter Name

Description

Required

Default Value

buckets_path

The path to the buckets we wish to find the average for (see the section called “buckets_path Syntaxedit” for more details)

Required

gap_policy

The policy to apply when gaps are found in the data (see the section called “Dealing with gaps in the dataedit” for more details)

Optional, defaults to skip

format

format to apply to the output value of this aggregation

Optional, defaults to null


The following snippet calculates the average of the total monthly sales:

POST /_search
{
  "size": 0,
  "aggs": {
    "sales_per_month": {
      "date_histogram": {
        "field": "date",
        "interval": "month"
      },
      "aggs": {
        "sales": {
          "sum": {
            "field": "price"
          }
        }
      }
    },
    "avg_monthly_sales": {
      "avg_bucket": {
        "buckets_path": "sales_per_month>sales" 
      }
    }
  }
}

buckets_path instructs this avg_bucket aggregation that we want the (mean) average value of the sales aggregation in the sales_per_month date histogram.

And the following may be the response:

{
   "took": 11,
   "timed_out": false,
   "_shards": ...,
   "hits": ...,
   "aggregations": {
      "sales_per_month": {
         "buckets": [
            {
               "key_as_string": "2015/01/01 00:00:00",
               "key": 1420070400000,
               "doc_count": 3,
               "sales": {
                  "value": 550.0
               }
            },
            {
               "key_as_string": "2015/02/01 00:00:00",
               "key": 1422748800000,
               "doc_count": 2,
               "sales": {
                  "value": 60.0
               }
            },
            {
               "key_as_string": "2015/03/01 00:00:00",
               "key": 1425168000000,
               "doc_count": 2,
               "sales": {
                  "value": 375.0
               }
            }
         ]
      },
      "avg_monthly_sales": {
          "value": 328.33333333333333
      }
   }
}
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