Is it possible to get last text field value on a transform aggregation?

Imagine we have an ecommerce, and an index with a document per every sale, with user and product fields. For each user I'd like to always know which is the last product they bought.
How could we tackle that?

Have a look at this:

This is part of the 7.7 documentation, however should work in older versions, too.

Awesome, thanks!

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