_mapping.json

{
  "access" : {
    "properties" : {
      "body_bytes_sent" : {
        "type" : "integer"
      },
      "protocol" : {
        "type" : "string"
      },
      "request_method" : {
        "type" : "string"
      },
      "request_time" : {
        "type" : "float"
      },
      "status" : {
        "type" : "string"
      },
      "timestamp" : {
        "type" : "date",
        "format" : "dateOptionalTime"
      },
      "url" : {
        "type" : "string"
      }
    }
  }
}

doc1.json

{
  "_id": "734pPtfbT8iv3rWAo_IzBg",
  "_index": "nginx",
  "_source": {
    "body_bytes_sent": 78,
    "protocol": "HTTP/1.1",
    "request_method": "GET",
    "request_time": 0.035000000000000003,
    "status": "200",
    "timestamp": "2013-10-07T21:36:01+00:00",
    "url": "redacted"
  },
  "_type": "access",
  "_version": 1,
  "exists": true
}

doc2.json

{
    "_id": "qAtMiBxpQs6uLdv61Uznpw",
    "_index": "nginx",
    "_source": {
        "body_bytes_sent": "475",
        "protocol": "HTTP/1.1",
        "request_method": "GET",
        "request_time": "0.088",
        "status": "200",
        "timestamp": "2013-10-07T21:43:36+00:00",
        "url": "redacted",
    },
    "_type": "access",
    "_version": 1,
    "exists": true
}