Similar to their [histogram](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-composite-aggregation.html#_histogram) counter-part, composite aggs could be extended to support [ranges](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-bucket-range-aggregation.html) (numeric, date, ip) as a value source.