title: Elastic Search. _Score is null in aggregations. Why?
body: <p>I use ES v 1.7. ES returns _score just only in "hits" section, but i'm not interested in "hits", I need data from "aggregations" section of responce <strong>with _score</strong>. Why ES do like that and How to fix it?</p>
  
  <p><strong>Requset:</strong></p>
  
  <pre><code>{
      "size": 1,
          "query": {
              "bool": {
                  "must": [
                      { "match": {"_all": {"query": "test","operator": "and","fuzziness": "2"}}}
                  ],
                  "should": [
                      { "multi_match" : {
                              "query":      "test"
                              ,"type":       "best_fields"
                              ,"fields":     ["ObjectData.PRTNAME","ObjectData.EXTERNALID","ObjectData.contactList.VALUE","*SERIES","*NUMBER","ObjectData.INN"]
                              ,"operator":   "or"
                              ,"boost": 3
                      }}
                  ]
              } 
          },   
    "aggs": {
      "byObjectID": {
        "terms": {"field": "ObjectID"},
        "aggs": {
          "latestVer": {
            "top_hits": {
              "sort": [{"creationDate": { "order": "desc" }}]
              ,"_source": { "include": ["ObjectData.BRIEFNAME", "creationDate", "ObjectID" ]}
              ,"size": 1
            }
          }
        }
      }
    }
  }
  </code></pre>
  
  <p><strong>Response:</strong></p>
  
  <pre><code>{
     "took": 16,
     "timed_out": false,
     "_shards":    {
        "total": 5,
        "successful": 5,
        "failed": 0
     },
     "hits":    {
        "total": 87,
        "max_score": 5.3479624,
        "hits": [      {
           "_index": "crmws",
           "_type": "participant",
           "_id": "AVFtAkIcSH3HWHh0wIkd",
           "_score": 5.3479624,
           "_source":          {
              "mostRecentVersion": null,
              "UserLogin": "ap",
              "creationDate": "2015-12-04T12:40:43.292Z",
              "_id": null,
              "ObjectID": 26784418,
              "EventID": null,
              "version_id": 3798,
              "ObjectTypeId": null,
              "ObjectData":   {...},
              "ObjectTypeSysName": "participant",
              "versionNumber": null
           }
        }]
     },
     "aggregations": {"byObjectID":    {
        "doc_count_error_upper_bound": 0,
        "sum_other_doc_count": 0,
        "buckets":       [
                    {
              "key": 26745417,
              "doc_count": 21,
              "latestVer": {"hits":             {
                 "total": 21,
                 "max_score": null,
                 "hits": [               {
                    "_index": "crmws",
                    "_type": "participant",
                    "_id": "AVFtQCCtSH3HWHh0wItF",
                    "_score": null,
                    "_source":                   {
                       "creationDate": "2015-12-04T13:48:17.949Z",
                       "ObjectID": 26745417,
                       "ObjectData": {"BRIEFNAME": "Верный-Преверный В. В."}
                    },
                    "sort": [1449236897949]
                 }]
              }}
           },
           ...
        ]
     }}
  }
  </code></pre>