Bucket aggregation is a family that provides mechanisms for segmenting document sets into groups (buckets). Thus, each bucket is associated with a criterion, which determines whether the document in the current context falls into it. The following sections will illustrate each type of aggregation in the bucket family.
Bucket aggregations
histogram
The purpose of the histogram aggregation is to group values into ranges with a fixed interval and count the documents. The starting range is 0 or a given offset. The range distance is specified by the interval value. The rounding formula is bucket_key = Math.floor((value - offset) / interval) * interval + offset. The "extended_bounds" : {"min" : lv,"max"...
