mysterious "missing" values

mapping_and_data.sh

# 2011-06-24 22:09:37:548 [DELETE] ("cb_development")
#
curl -X DELETE "http://localhost:9200/cb_development"

# 2011-06-24 22:09:37:548 [200]

# 2011-06-24 22:09:49:414 [CREATE] ("cb_development")
#
curl -X POST "http://localhost:9200/cb_development" -d '
{
    "mappings": {
        "document": {
            "properties": {
                "author_ids": {
                    "analyzed": false, 
                    "type": "string"
                }, 
                "source_ids": {
                    "analyzed": false, 
                    "type": "string"
                }, 
                "id": {
                    "analyzed": false, 
                    "type": "string"
                }
            }
        }
    }
}
'

# 2011-06-24 22:09:49:414 [200]

# 2011-06-24 22:09:52:361 [BULK] ("cb_development")
#
curl -X POST "http://localhost:9200/_bulk" -d '
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb00000b"}}
{"id":"4e0498175c1fde6ecb00000b","author_ids":["4e0498185c1fde6ecb000057"],"source_ids":["4e0498195c1fde6ecb0000a7"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb000010"}}
{"id":"4e0498175c1fde6ecb000010","author_ids":["4e0498185c1fde6ecb00005d"],"source_ids":["4e0498195c1fde6ecb0000a3"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb000011"}}
{"id":"4e0498175c1fde6ecb000011","author_ids":["4e0498185c1fde6ecb00005c"],"source_ids":["4e0498195c1fde6ecb0000ab"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000017"}}
{"id":"4e0498185c1fde6ecb000017","author_ids":["4e0498185c1fde6ecb000065"],"source_ids":["4e0498195c1fde6ecb0000b2"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00001b"}}
{"id":"4e0498185c1fde6ecb00001b","author_ids":["4e0498185c1fde6ecb000069"],"source_ids":["4e0498195c1fde6ecb0000b5"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00001e"}}
{"id":"4e0498185c1fde6ecb00001e","author_ids":["4e0498185c1fde6ecb00006c"],"source_ids":["4e0498195c1fde6ecb0000a2"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000022"}}
{"id":"4e0498185c1fde6ecb000022","author_ids":["4e0498185c1fde6ecb00006d"],"source_ids":["4e0498195c1fde6ecb0000b8"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000025"}}
{"id":"4e0498185c1fde6ecb000025","author_ids":["4e0498185c1fde6ecb000075"],"source_ids":["4e0498195c1fde6ecb0000bb"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000029"}}
{"id":"4e0498185c1fde6ecb000029","author_ids":["4e0498185c1fde6ecb000079"],"source_ids":["4e0498195c1fde6ecb0000b5"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00002c"}}
{"id":"4e0498185c1fde6ecb00002c","author_ids":["4e0498185c1fde6ecb00007e"],"source_ids":["4e0498195c1fde6ecb0000c0"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000031"}}
{"id":"4e0498185c1fde6ecb000031","author_ids":["4e0498185c1fde6ecb000083"],"source_ids":["4e0498195c1fde6ecb0000c2"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000033"}}
{"id":"4e0498185c1fde6ecb000033","author_ids":["4e0498185c1fde6ecb000085"],"source_ids":["4e0498195c1fde6ecb0000c0"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000037"}}
{"id":"4e0498185c1fde6ecb000037","author_ids":["4e0498185c1fde6ecb000089"],"source_ids":["4e0498195c1fde6ecb0000c0"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00003c"}}
{"id":"4e0498185c1fde6ecb00003c","author_ids":["4e0498185c1fde6ecb000096"],"source_ids":["4e0498195c1fde6ecb0000c9"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb000001"}}
{"id":"4e0498175c1fde6ecb000001","author_ids":["4e0498185c1fde6ecb00004c"],"source_ids":["4e0498195c1fde6ecb00009d"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb000002"}}
{"id":"4e0498175c1fde6ecb000002","author_ids":["4e0498185c1fde6ecb00004d"],"source_ids":["4e0498195c1fde6ecb00009e"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb000003"}}
{"id":"4e0498175c1fde6ecb000003","author_ids":["4e0498185c1fde6ecb00004e"],"source_ids":["4e0498195c1fde6ecb00009f"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb000004"}}
{"id":"4e0498175c1fde6ecb000004","author_ids":["4e0498185c1fde6ecb00004f"],"source_ids":["4e0498195c1fde6ecb0000a0"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb000005"}}
{"id":"4e0498175c1fde6ecb000005","author_ids":["4e0498185c1fde6ecb000050"],"source_ids":["4e0498195c1fde6ecb0000a1"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb000006"}}
{"id":"4e0498175c1fde6ecb000006","author_ids":["4e0498185c1fde6ecb000051"],"source_ids":["4e0498195c1fde6ecb0000a2"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb000007"}}
{"id":"4e0498175c1fde6ecb000007","author_ids":["4e0498185c1fde6ecb000053"],"source_ids":["4e0498195c1fde6ecb0000a4"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb000008"}}
{"id":"4e0498175c1fde6ecb000008","author_ids":["4e0498185c1fde6ecb000052"],"source_ids":["4e0498195c1fde6ecb0000a3"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb000009"}}
{"id":"4e0498175c1fde6ecb000009","author_ids":["4e0498185c1fde6ecb000054","4e0498185c1fde6ecb000055"],"source_ids":["4e0498195c1fde6ecb0000a5"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb00000a"}}
{"id":"4e0498175c1fde6ecb00000a","author_ids":["4e0498185c1fde6ecb000056"],"source_ids":["4e0498195c1fde6ecb0000a6"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb00000c"}}
{"id":"4e0498175c1fde6ecb00000c","author_ids":["4e0498185c1fde6ecb000058"],"source_ids":["4e0498195c1fde6ecb0000a8"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb00000d"}}
{"id":"4e0498175c1fde6ecb00000d","author_ids":["4e0498185c1fde6ecb000059"],"source_ids":["4e0498195c1fde6ecb00009e"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb00000e"}}
{"id":"4e0498175c1fde6ecb00000e","author_ids":["4e0498185c1fde6ecb00005a"],"source_ids":["4e0498195c1fde6ecb0000a9"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb00000f"}}
{"id":"4e0498175c1fde6ecb00000f","author_ids":["4e0498185c1fde6ecb00005b"],"source_ids":["4e0498195c1fde6ecb0000aa"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498175c1fde6ecb000012"}}
{"id":"4e0498175c1fde6ecb000012","author_ids":["4e0498185c1fde6ecb000061"],"source_ids":["4e0498195c1fde6ecb0000ae"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000013"}}
{"id":"4e0498185c1fde6ecb000013","author_ids":["4e0498185c1fde6ecb00005f","4e0498185c1fde6ecb000060"],"source_ids":["4e0498195c1fde6ecb0000ac"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000014"}}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000015"}}
{"id":"4e0498185c1fde6ecb000015","author_ids":["4e0498185c1fde6ecb00005e"],"source_ids":["4e0498195c1fde6ecb0000ad"]}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000018"}}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000019"}}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00001a"}}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00001c"}}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00001d"}}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00001f"}}
{"id":"4e0498185c1fde6ecb00001f","author_ids":["4e0498185c1fde6ecb000064"],"source_ids":["4e0498195c1fde6ecb0000af"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000020"}}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000027"}}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00002a"}}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00002e"}}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00002f"}}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000036"}}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00003a"}}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00003d"}}
{"id":"4e0498185c1fde6ecb00003d","author_ids":["4e0498185c1fde6ecb000070"],"source_ids":["4e0498195c1fde6ecb0000c5"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00003e"}}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000043"}}
{"id":"4e0498185c1fde6ecb000043","author_ids":["4e0498185c1fde6ecb000093"],"source_ids":["4e0498195c1fde6ecb0000c9"]}
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{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000048"}}
{"id":"4e0498185c1fde6ecb000048","author_ids":["4e0498185c1fde6ecb000099"],"source_ids":["4e0498195c1fde6ecb0000ce"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb000049"}}
{"id":"4e0498185c1fde6ecb000049","author_ids":["4e0498185c1fde6ecb00009a"],"source_ids":["4e0498195c1fde6ecb0000cf"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00004a"}}
{"id":"4e0498185c1fde6ecb00004a","author_ids":["4e0498185c1fde6ecb00009b"],"source_ids":["4e0498195c1fde6ecb0000d0"]}
{"index":{"_index":"cb_development","_type":"document","_id":"4e0498185c1fde6ecb00004b"}}
{"id":"4e0498185c1fde6ecb00004b","author_ids":["4e0498185c1fde6ecb00009c"],"source_ids":["4e0498195c1fde6ecb0000d1"]}
'

# 2011-06-24 22:09:52:361 [200]

query.sh

curl -X GET "http://localhost:9200/cb_development/_search?pretty=true" -d '
{
    "facets": {
        "current_authors": {
            "terms": {
                "field": "author_ids", 
                "all_terms": false, 
                "size": 10
            }
        }, 
        "current_sources": {
            "terms": {
                "field": "source_ids", 
                "all_terms": false, 
                "size": 10
            }
        }
    }
}
'

result.json

{
  "took" : 4,
  "timed_out" : false,
  "_shards" : {
    "total" : 5,
    "successful" : 5,
    "failed" : 0
  },
  "hits" : {
    "total" : 75,
    "max_score" : 1.0,
    "hits" : [ {
      "_index" : "cb_development",
      "_type" : "document",
      "_id" : "4e04a0825c1fde70c5000004",
      "_score" : 1.0, "_source" : {"id":"4e04a0825c1fde70c5000004","author_ids":["4e04a0825c1fde70c500004f"],"source_ids":["4e04a0845c1fde70c50000a0"]}
    }, {
      "_index" : "cb_development",
      "_type" : "document",
      "_id" : "4e04a0825c1fde70c5000009",
      "_score" : 1.0, "_source" : {"id":"4e04a0825c1fde70c5000009","author_ids":["4e04a0825c1fde70c5000054","4e04a0825c1fde70c5000055"],"source_ids":["4e04a0845c1fde70c50000a5"]}
    }, {
      "_index" : "cb_development",
      "_type" : "document",
      "_id" : "4e04a0825c1fde70c5000016",
      "_score" : 1.0, "_source" : {"id":"4e04a0825c1fde70c5000016","author_ids":["4e04a0825c1fde70c5000063"],"source_ids":["4e04a0845c1fde70c50000a5"]}
    }, {
      "_index" : "cb_development",
      "_type" : "document",
      "_id" : "4e04a0825c1fde70c500000a",
      "_score" : 1.0, "_source" : {"id":"4e04a0825c1fde70c500000a","author_ids":["4e04a0825c1fde70c5000056"],"source_ids":["4e04a0845c1fde70c50000a6"]}
    }, {
      "_index" : "cb_development",
      "_type" : "document",
      "_id" : "4e04a0825c1fde70c500000f",
      "_score" : 1.0, "_source" : {"id":"4e04a0825c1fde70c500000f","author_ids":["4e04a0825c1fde70c500005b"],"source_ids":["4e04a0845c1fde70c50000aa"]}
    }, {
      "_index" : "cb_development",
      "_type" : "document",
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      "_score" : 1.0, "_source" : {"id":"4e04a0825c1fde70c5000011","author_ids":["4e04a0825c1fde70c500005c"],"source_ids":["4e04a0845c1fde70c50000ab"]}
    }, {
      "_index" : "cb_development",
      "_type" : "document",
      "_id" : "4e04a0825c1fde70c500002e",
      "_score" : 1.0, "_source" : {"id":"4e04a0825c1fde70c500002e","author_ids":["4e04a0825c1fde70c5000061"],"source_ids":["4e04a0845c1fde70c50000ae"]}
    }, {
      "_index" : "cb_development",
      "_type" : "document",
      "_id" : "4e04a0825c1fde70c5000035",
      "_score" : 1.0, "_source" : {"id":"4e04a0825c1fde70c5000035","author_ids":["4e04a0835c1fde70c5000087"],"source_ids":["4e04a0845c1fde70c50000ae"]}
    }, {
      "_index" : "cb_development",
      "_type" : "document",
      "_id" : "4e04a0825c1fde70c500003b",
      "_score" : 1.0, "_source" : {"id":"4e04a0825c1fde70c500003b","author_ids":["4e04a0835c1fde70c500008b"],"source_ids":["4e04a0845c1fde70c50000ae"]}
    }, {
      "_index" : "cb_development",
      "_type" : "document",
      "_id" : "4e04a0825c1fde70c5000042",
      "_score" : 1.0, "_source" : {"id":"4e04a0825c1fde70c5000042","author_ids":["4e04a0835c1fde70c5000091","4e04a0835c1fde70c5000092"],"source_ids":["4e04a0845c1fde70c50000b3"]}
    } ]
  },
  "facets" : {
    "current_authors" : {
      "_type" : "terms",
      "missing" : 52,
      "terms" : [ {
        "term" : "4e04a0835c1fde70c500009c",
        "count" : 1
      }, {
        "term" : "4e04a0835c1fde70c500009b",
        "count" : 1
      }, {
        "term" : "4e04a0835c1fde70c500009a",
        "count" : 1
      }, {
        "term" : "4e04a0835c1fde70c5000099",
        "count" : 1
      }, {
        "term" : "4e04a0835c1fde70c5000098",
        "count" : 1
      }, {
        "term" : "4e04a0835c1fde70c5000097",
        "count" : 1
      }, {
        "term" : "4e04a0835c1fde70c5000096",
        "count" : 1
      }, {
        "term" : "4e04a0835c1fde70c5000095",
        "count" : 1
      }, {
        "term" : "4e04a0835c1fde70c5000094",
        "count" : 1
      }, {
        "term" : "4e04a0835c1fde70c5000093",
        "count" : 1
      } ]
    },
    "current_sources" : {
      "_type" : "terms",
      "missing" : 0,
      "terms" : [ {
        "term" : "4e04a0845c1fde70c50000ae",
        "count" : 8
      }, {
        "term" : "4e04a0845c1fde70c50000c0",
        "count" : 5
      }, {
        "term" : "4e04a0845c1fde70c50000a2",
        "count" : 3
      }, {
        "term" : "4e04a0845c1fde70c50000c9",
        "count" : 2
      }, {
        "term" : "4e04a0845c1fde70c50000c5",
        "count" : 2
      }, {
        "term" : "4e04a0845c1fde70c50000be",
        "count" : 2
      }, {
        "term" : "4e04a0845c1fde70c50000b5",
        "count" : 2
      }, {
        "term" : "4e04a0845c1fde70c50000a5",
        "count" : 2
      }, {
        "term" : "4e04a0845c1fde70c50000a3",
        "count" : 2
      }, {
        "term" : "4e04a0845c1fde70c500009e",
        "count" : 2
      } ]
    }
  }
}

The issue is the "missing" number in the "current_authors" facet. I would expect it to be zero.