gistfile1.sh

Create your index:

    curl -XPUT 'http://127.0.0.1:9200/site462/?pretty=1'  -d '
    {
       "mappings" : {
          "contact_notes" : {
             "type" : "object",
             "properties" : {
                "notes_emails" : {
                   "type" : "object",
                   "properties" : {
                      "subject" : {
                         "type" : "string",
                         "term_vector" : "with_positions_offsets"
                      },
                      "_id" : {
                         "type" : "integer"
                      },
                      "modification_date" : {
                         "type" : "date"
                      },
                      "creation_date" : {
                         "type" : "date"
                      },
                      "text" : {
                         "type" : "string",
                         "term_vector" : "with_positions_offsets"
                      },
                      "reference_type" : {
                         "type" : "integer"
                      },
                      "modified_by" : {
                         "type" : "integer"
                      },
                      "type" : {
                         "index" : "not_analyzed",
                         "type" : "string"
                      },
                      "activity_type" : {
                         "index" : "not_analyzed",
                         "type" : "string"
                      },
                      "created_by" : {
                         "index" : "not_analyzed",
                         "type" : "integer"
                      }
                   }
                }
             }
          }
       }
    }
    '

Bulk index some data:

    curl -XPOST 'http://127.0.0.1:9200/site462/_bulk?pretty=1'  -d '
    {"index" : {"_index" : "site462", "_id" : "1340", "_type" : "contact_notes"}}
    {"notes_emails" : {"modification_date" : "2012-03-16T09:40:31.725Z", "creation_date" : "2012-03-16T09:40:31.725Z", "reference_type" : 10, "text" : "my test note", "_id" : 117, "modified_by" : 342, "type" : "ActivityContact", "created_by" : 342}}
    {"index" : {"_index" : "site462", "_id" : "1706", "_type" : "contact_notes"}}
    {"notes_emails" : {"modification_date" : "2012-07-04T22:16:18.644Z", "creation_date" : "2012-07-04T21:57:57.665Z", "reference_type" : 10, "text" : "another test note", "_id" : 329, "modified_by" : 363, "type" : "ActivityContact", "created_by" : 363}}
    {"index" : {"_index" : "site462", "_id" : "1703", "_type" : "contact_notes"}}
    {"notes_emails" : {"modification_date" : "2012-07-03T11:08:53.699Z", "creation_date" : "2011-12-28T07:29:07.715Z", "reference_type" : 70, "text" : "test note", "_id" : 37, "modified_by" : 342, "type" : "ActivityContact", "created_by" : 342}}
    {"index" : {"_index" : "site462", "_id" : "1341", "_type" : "contact_notes"}}
    {"notes_emails" : {"modification_date" : "2011-12-05T13:21:57.668Z", "creation_date" : "2011-12-05T13:21:57.668Z", "text" : "test d", "_id" : 26, "modified_by" : 342, "type" : "ActivityContact", "created_by" : 342}}
    '

Your original query (with "from" adjusted):

    curl -XGET 'http://127.0.0.1:9200/site462/_search?pretty=1'  -d '
    {
       "from" : 0,
       "query" : {
          "filtered" : {
             "filter" : {
                "term" : {
                   "notes_emails.reference_type" : "10"
                }
             },
             "query" : {
                "bool" : {
                   "must" : [
                      {
                         "term" : {
                            "notes_emails.reference_type" : "10"
                         }
                      }
                   ]
                }
             }
          }
       },
       "size" : 10
    }
    '

    # [Mon Feb 11 13:22:14 2013] Response:
    # {
    #    "hits" : {
    #       "hits" : [
    #          {
    #             "_source" : {
    #                "notes_emails" : {
    #                   "modification_date" : "2012-03-16T09:40:31.725Z",
    #                   "creation_date" : "2012-03-16T09:40:31.725Z",
    #                   "_id" : 117,
    #                   "text" : "my test note",
    #                   "reference_type" : 10,
    #                   "modified_by" : 342,
    #                   "type" : "ActivityContact",
    #                   "created_by" : 342
    #                }
    #             },
    #             "_score" : 1,
    #             "_index" : "site462",
    #             "_id" : "1340",
    #             "_type" : "contact_notes"
    #          },
    #          {
    #             "_source" : {
    #                "notes_emails" : {
    #                   "modification_date" : "2012-07-04T22:16:18.644Z",
    #                   "creation_date" : "2012-07-04T21:57:57.665Z",
    #                   "_id" : 329,
    #                   "text" : "another test note",
    #                   "reference_type" : 10,
    #                   "modified_by" : 363,
    #                   "type" : "ActivityContact",
    #                   "created_by" : 363
    #                }
    #             },
    #             "_score" : 1,
    #             "_index" : "site462",
    #             "_id" : "1706",
    #             "_type" : "contact_notes"
    #          }
    #       ],
    #       "max_score" : 1,
    #       "total" : 2
    #    },
    #    "timed_out" : false,
    #    "_shards" : {
    #       "failed" : 0,
    #       "successful" : 5,
    #       "total" : 5
    #    },
    #    "took" : 4
    # }

Your query rewritten to just use a filter clause:

    curl -XGET 'http://127.0.0.1:9200/site462/_search?pretty=1'  -d '
    {
       "query" : {
          "constant_score" : {
             "filter" : {
                "term" : {
                   "notes_emails.reference_type" : 10
                }
             }
          }
       }
    }
    '

Or combined with a full text query:

    curl -XGET 'http://127.0.0.1:9200/site462/_search?pretty=1'  -d '
    {
       "query" : {
          "filtered" : {
             "filter" : {
                "term" : {
                   "notes_emails.reference_type" : 10
                }
             },
             "query" : {
                "match" : {
                   "text" : "test"
                }
             }
          }
       }
    }
    '