AggregationRange

A single bucket range for a range or date_range aggregation. At least one of from / to is required; the bucket covers [from, to).

Field	Type	Description
from	OBJECT	Optional. Inclusive lower bound. A number, or a date / date-math string on a date_range.
to	OBJECT	Optional. Exclusive upper bound. A number, or a date / date-math string on a date_range.
key	STRING	Optional. Caller-chosen label for this bucket in the result.