Elasticsearch facet bad count ?

gistfile1.js

// First request : calculate "dotc" facet on a match_all query :

{
  "query":{"match_all":{}},
  "facets":{
    "dotc":{"terms":{"field":"Utilisateur.dotc_id"}}
  },
  "size":0
}

// The count for id "7" is 31 (it's actually false : it should be 45) :
{
"facets": {
  "dotc": {
    "_type": "terms",
    "missing": 0,
    "total": 1320,
    "other": 655,
    "terms": [(10)
      {
        "term": "7",
        "count": 31
      },
    ]
  }
}
}

// Second request, with a query on the term "anjou". I'm waiting for 45 results :
{
  "query":{"query_string": { "query" : "anjou"}},
  "facets":{
    "dotc":{"terms":{"field":"Utilisateur.dotc_id"}}
  },
  "size":0
}

// Okay. Count for id "7" is 45 :
{
"facets": {
  "dotc": {
    "_type": "terms",
    "missing": 0,
    "total": 45,
    "other": 0,
    "terms": [(1)
    {
      "term": "7",
      "count": 45
    }
  ]
}
}