Test for https://github.com/elasticsearch/elasticsearch/pull/5728

1. Run Me

curl -XDELETE "http://localhost:9200/contests"
curl -XPUT "http://localhost:9200/contests" -d'
{
  "mappings": {
    "contest": {
      "properties": {
        "contestant": {
          "type": "nested",
          "properties": {
            "id": {
              "type": "string",
              "index": "not_analyzed"
            },
            "data": {
              "type": "nested",
              "properties": {
                "timing": {
                  "type": "integer"
                },
                "expectedTiming": {
                  "type": "integer"
                }
              }
            }
          }
        }
      }
    }
  }
}'

curl -XPUT "http://localhost:9200/contests/contest/1" -d'
{
  "contestant": [
    {
      "id": "alice",
      "data": [
        {
          "timing": 1,
          "expectedTiming": 2
        },
        {
          "timing": 2,
          "expectedTiming": 2
        }
      ]
    },
    {
      "id": "jane",
      "data": [
        {
          "timing": 3,
          "expectedTiming": 2
        },
        {
          "timing": 4,
          "expectedTiming": 2
        }
      ]
    }
  ]
}'

curl -XPUT "http://localhost:9200/contests/contest/2" -d'
{
  "contestant": [
    {
      "id": "alice",
      "data": [
        {
          "timing": 1,
          "expectedTiming": 2
        },
        {
          "timing": 2,
          "expectedTiming": 2
        }
      ]
    },
    {
      "id": "jane",
      "data": [
        {
          "timing": 3,
          "expectedTiming": 2
        },
        {
          "timing": 4,
          "expectedTiming": 2
        }
      ]
    }
  ]
}'

curl -XGET "http://localhost:9200/contests/_search" -d'
{
  "aggs": {
    "myResults": {
      "nested": {
        "path": "contestant"
      },
      "aggs": {
        "per_contestant": {
          "terms": {
            "field": "id"
          },
          "aggs": {
            "contestant_data": {
              "nested": {
                "path": "contestant.data"
              },
              "aggs": {
                "timing_total": {
                  "sum": {
                    "field": "timing"
                  }
                }
              }
            }
          }
        }
      }
    }
  },
  "explain": true
}'

2. Result

{
   "took": 1,
   "timed_out": false,
   "_shards": {
      "total": 5,
      "successful": 5,
      "failed": 0
   },
   "hits": {
      "total": 2,
      "max_score": 1,
      "hits": [
         {
            "_shard": 2,
            "_node": "6juKykbISA-hUwWyAy3rLw",
            "_index": "contests",
            "_type": "contest",
            "_id": "1",
            "_score": 1,
            "_source": {
               "contestant": [
                  {
                     "id": "alice",
                     "data": [
                        {
                           "timing": 1,
                           "expectedTiming": 2
                        },
                        {
                           "timing": 2,
                           "expectedTiming": 2
                        }
                     ]
                  },
                  {
                     "id": "jane",
                     "data": [
                        {
                           "timing": 3,
                           "expectedTiming": 2
                        },
                        {
                           "timing": 4,
                           "expectedTiming": 2
                        }
                     ]
                  }
               ]
            },
            "_explanation": {
               "value": 1,
               "description": "ConstantScore(cache(org.elasticsearch.index.search.nested.NonNestedDocsFilter@953b6c6c)), product of:",
               "details": [
                  {
                     "value": 1,
                     "description": "boost"
                  },
                  {
                     "value": 1,
                     "description": "queryNorm"
                  }
               ]
            }
         },
         {
            "_shard": 3,
            "_node": "6juKykbISA-hUwWyAy3rLw",
            "_index": "contests",
            "_type": "contest",
            "_id": "2",
            "_score": 1,
            "_source": {
               "contestant": [
                  {
                     "id": "alice",
                     "data": [
                        {
                           "timing": 1,
                           "expectedTiming": 2
                        },
                        {
                           "timing": 2,
                           "expectedTiming": 2
                        }
                     ]
                  },
                  {
                     "id": "jane",
                     "data": [
                        {
                           "timing": 3,
                           "expectedTiming": 2
                        },
                        {
                           "timing": 4,
                           "expectedTiming": 2
                        }
                     ]
                  }
               ]
            },
            "_explanation": {
               "value": 1,
               "description": "ConstantScore(cache(org.elasticsearch.index.search.nested.NonNestedDocsFilter@953b6c6c)), product of:",
               "details": [
                  {
                     "value": 1,
                     "description": "boost"
                  },
                  {
                     "value": 1,
                     "description": "queryNorm"
                  }
               ]
            }
         }
      ]
   },
   "aggregations": {
      "myResults": {
         "doc_count": 4,
         "per_contestant": {
            "buckets": [
               {
                  "key": "alice",
                  "doc_count": 2,
                  "contestant_data": {
                     "doc_count": 4,
                     "timing_total": {
                        "value": 6
                     }
                  }
               },
               {
                  "key": "jane",
                  "doc_count": 2,
                  "contestant_data": {
                     "doc_count": 4,
                     "timing_total": {
                        "value": 14
                     }
                  }
               }
            ]
         }
      }
   }
}