Problem with terms facet multi fields?

[Nick Chang]

Hello

Why does not like Mysql count(DISTINCT userId, prdId) ??

{
   "facets": {
      "book": {
         "terms": {
             "fields": [
                "userId","prdId"
             ], 
            "size": 10,
            "order": "count"
         }
      }
   },
   "size": 0
}

result : 
   "facets": {
      "book": {
         "_type": "terms",
         "missing": 299410,
         "total": 1765354,
         "other": 1483806,
         "terms": [
            {
               "term": "(Facebook)a...@gmail.com",
               "count": 119710
            },
            {
               "term": "guest",
               "count": 76341
            },
            {
               "term": "0100051552",
               "count": 18563
            },

Is't my misunderstanding?? or I lost other parameter??

Thanks

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