### Description There is a meta-task for adding [Cartesian support for aggregations](https://github.com/elastic/elasticsearch/issues/87804), and this issue is one of the proposed sub-tasks, the line aggregation. It is modelled on the existing [`geo_line`](https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-metrics-geo-line.html) and as such could be called either: * `cartesian_line` * or just `line` It is expected to be based on the previous work on https://github.com/elastic/elasticsearch/issues/90156 and https://github.com/elastic/elasticsearch/issues/90157
Description
There is a meta-task for adding Cartesian support for aggregations, and this issue is one of the proposed sub-tasks, the line aggregation.
It is modelled on the existing
geo_lineand as such could be called either:cartesian_linelineIt is expected to be based on the previous work on #90156 and #90157