elasticsearch avg problem

query.json

{
  "size": 0,
  "query": {
    "filtered": {
      "query": {
        "query_string": {
          "query": "*",
          "analyze_wildcard": true
        }
      },
      "filter": {
        "bool": {
          "must": [
            {
              "range": {
                "@timestamp": {
                  "gte": 1402141719395,
                  "lte": 1433677719395
                }
              }
            }
          ],
          "must_not": []
        }
      }
    }
  },
  "aggs": {
    "2": {
      "date_histogram": {
        "field": "@timestamp",
        "interval": "1w",
        "pre_zone": "+03:00",
        "pre_zone_adjust_large_interval": true,
        "min_doc_count": 1,
        "extended_bounds": {
          "min": 1402141719394,
          "max": 1433677719395
        }
      },
      "aggs": {
        "1": {
          "avg": {
            "script": "doc['properties.Page: Number Pageview'].value * 2",
            "lang": "expression"
          }
        },
        "4": {
          "avg": {
            "field": "properties.Page: Number Pageview"
          }
        }
      }
    }
  }
}

template config.json

//PUT _template/logging_default
{
  "template": "logstash-*",
  "settings": {
    "number_of_shards": 1,
     "number_of_replicas": 0
  },
  "mappings": {
    "_default_": {
      "dynamic_templates": [
        {
          "notanalyzed": {
            "match": "*",
            "match_mapping_type": "string",
            "mapping": {
              "index": "not_analyzed",
              "type": "string",
              "stored":false,
               "doc_values": true
            }
          }
        }
      ],
      "_all": {"enabled": false},
      "_source" : {"enabled" : false}
    }
  }
}