Limit result based on query_string condition

I have a query string like this:

 "query_string" : {
            "query" : "dc_name:(\"dc1\" or \"dc2\" or \"dc3\")"

This return all results, but I don't need all. I just need a result per each DC.
basically, instead of returning all results, is it possible to return just 1 result per DC?
Basically, I should get just 3 results for the above query: 1 for dc1, 1 for dc2, and 1 for dc3. Instead of all results, which could be thousands.

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