Module metrics 

The aggregations in this family compute metrics based on values extracted in one way or another from the documents that are being aggregated. The values are typically extracted from the fields of the document (using the field data), but can also be generated using scripts.

Numeric metrics aggregations are a special type of metrics aggregation which output numeric values. Some aggregations output a single numeric metric (e.g. avg) and are called single-value numeric metrics aggregation, others generate multiple metrics (e.g. stats) and are called multi-value numeric metrics aggregation. The distinction between single-value and multi-value numeric metrics aggregations plays a role when these aggregations serve as direct sub-aggregations of some bucket aggregations (some bucket aggregations enable you to sort the returned buckets based on the numeric metrics in each bucket).

https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-metrics.html

Structs

AvgAggregation

A single-value metrics aggregation that computes the average of numeric values that are extracted from the aggregated documents. These values can be extracted either from specific numeric fields in the documents.

BoxplotAggregation

A boxplot metrics aggregation that computes boxplot of numeric values extracted from the aggregated documents. These values can be generated from specific numeric or histogram fields in the documents.

CardinalityAggregation

A single-value metrics aggregation that calculates an approximate count of distinct values.

MaxAggregation

A single-value metrics aggregation that keeps track and returns the maximum value among the numeric values extracted from the aggregated documents.

MinAggregation

A single-value metrics aggregation that keeps track and returns the minimum value among numeric values extracted from the aggregated documents.

RateAggregation

A rate metrics aggregation can be used only inside a date_histogram and calculates a rate of documents or a field in each date_histogram bucket. The field values can be generated extracted from specific numeric or histogram fields in the documents.

SumAggregation

A single-value metrics aggregation that sums up numeric values that are extracted from the aggregated documents. These values can be extracted either from specific numeric or histogram fields.

TopHitsAggregation

A top_hits metric aggregation keeps track of the most relevant document being aggregated. This aggregation is intended to be used as a sub aggregation, so that the top matching documents can be aggregated per bucket.