Is there a way to create documents which contain other documents as fields?

I want to make categories searchable. A category can have any number of "regular" documents in it.

My regular documents are not very heavy to search. They have 2 fields with a total of about 100 words. So I was thinking of creating documents which have a type of category and these documents will have a field "meta_field" which is just a concatenation of all of the documents' fields (or some subset of them) that belong to that category. Is there any standard way of doing something like this? Does what I am suggesting make sense?

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