Facets but no count needed

Is it possible to do a facet search to get all values in a particular field for a set of documents, but without needing the counts? For example, facet to get all unique tags across a set of documents, but don't bother doing the counts?

I know I can facet and just ignore the counts, but I assume it would be faster if ES knew ahead of time not to bother counting. Like just dump directly in a hashmap, and don't do a lookup prior to each insert to increment counts.

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