[Discuss] What should we name the new aggregation engine?

### Description

#13568 introduced this cool new aggregation engine that needs a name. To keep referring to it as "the new aggregation engine" gets tedious.
I asked people for [suggestions](https://app.sli.do/event/8jy7jPh5KxXZVK4LJCR1WA) at Community Over Code and also mentioned this to @epotyom and @Shradha26. I'm curious what the broader community thinks.

Start by reading issue #13568 to understand the aggregation engine being discussed, then review the linked Community Over Code suggestions and the existing discussion here. Done means the community and maintainers agree on a name; no implementation file or test is identified in this issue.

Written by the indexing model from the issue text.