elasticsearch (1.0.1) multi-field terms facet counts the same document twice

gistfile1.txt

# reproduced with elasticsearch 1.0.1: 

# index a document with 2 fields, both with the same value (the index will be implicitly generated)

curl -XPOST 'http://localhost:9200/test/test/2' -d '{
    "first_name": "Rochelle",
    "last_name": "Rochelle"
}'

# multi-field terms facet counts the document twice ('count = 2' for the term 'Rochelle') 

curl 'http://localhost:9200/test/_search?pretty' -d '{
    "size": 0,
    "query": {
        "match_all": {}
    },
    "facets": {
        "names": {
            "terms": {
                "fields": ["first_name", "last_name"]
            }
        }
    }
}'

# terms facet result:

{
  "took" : 2,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 1,
    "max_score" : 0.0,
    "hits" : [ ]
  },
  "facets" : {
    "names" : {
      "_type" : "terms",
      "missing" : 0,
      "total" : 2,
      "other" : 0,
      "terms" : [ {
        "term" : "rochelle",
        "count" : 2
      } ]
    }
  }
}