Aggregate whole groups when search machtes only a few items of that group

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Hi, i am looking for a solution of the following problem.

I have 20 million "Item" objects. Each Item Object have a GroupId property where 1-5000 Items a grouped together. Each Item has some other properties we can use to filter.

My problem is now that I want to get and aggregate all Items of a group where my complex search (on the other properties) matches at least one item of that group.

If I would only get the items, I could do a search where I get all GroupIds from my complex search. And then do a simple query to get all data where GroupIds in that list.

But how to aggregate that? Especially when there can be 1mio Items in the resultset?

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