Returning count of buckets from aggregation terms search

Before anyone suggests it, I am trying to use the terms aggregation with a very large size value to get a more exact number as opposed to using cardinality. I realize it's less efficient but I'm only searching around 75k records and it seems to only take ~400ms to run. If that's a bad idea for some reason let me know! If it's fine to do this, how can I get the count of buckets back from the search? Preferably, I don't want to get back the buckets themselves at all; just the count.

"aggs": {
  "distinct": {
      "terms": {
          "field": "uniqueVal.enum",
          "size": 100000

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