elasticsearch/docs/reference/aggregations/search-aggregations-pipeline-cumulative-sum-aggregation.md

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Cumulative sum	https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-pipeline-cumulative-sum-aggregation.html

Cumulative sum aggregation [search-aggregations-pipeline-cumulative-sum-aggregation]

A parent pipeline aggregation which calculates the cumulative sum of a specified metric in a parent histogram (or date_histogram) aggregation. The specified metric must be numeric and the enclosing histogram must have min_doc_count set to 0 (default for histogram aggregations).

Syntax [_syntax_13]

A cumulative_sum aggregation looks like this in isolation:

{
  "cumulative_sum": {
    "buckets_path": "the_sum"
  }
}

$$$cumulative-sum-params$

Parameter Name	Description	Required	Default Value
buckets_path	The path to the buckets we wish to find the cumulative sum for (see buckets_path Syntax for more details)	Required
format	DecimalFormat pattern for theoutput value. If specified, the formatted value is returned in the aggregation’svalue_as_string property	Optional	null

The following snippet calculates the cumulative sum of the total monthly sales:

POST /sales/_search
{
  "size": 0,
  "aggs": {
    "sales_per_month": {
      "date_histogram": {
        "field": "date",
        "calendar_interval": "month"
      },
      "aggs": {
        "sales": {
          "sum": {
            "field": "price"
          }
        },
        "cumulative_sales": {
          "cumulative_sum": {
            "buckets_path": "sales" <1>
          }
        }
      }
    }
  }
}

1. buckets_path instructs this cumulative sum aggregation to use the output of the sales aggregation for the cumulative sum

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
               },
               "cumulative_sales": {
                  "value": 550.0
               }
            },
            {
               "key_as_string": "2015/02/01 00:00:00",
               "key": 1422748800000,
               "doc_count": 2,
               "sales": {
                  "value": 60.0
               },
               "cumulative_sales": {
                  "value": 610.0
               }
            },
            {
               "key_as_string": "2015/03/01 00:00:00",
               "key": 1425168000000,
               "doc_count": 2,
               "sales": {
                  "value": 375.0
               },
               "cumulative_sales": {
                  "value": 985.0
               }
            }
         ]
      }
   }
}