elasticsearch-js/docs/reference/api/AggregationsDateRangeExpression.md

AggregationsDateRangeExpression [interface-AggregationsDateRangeExpression]

Name	Type	Description
from	AggregationsFieldDateMath	Start of the range (inclusive).
key	string	Custom key to return the range with.
to	AggregationsFieldDateMath	End of the range (exclusive).