types - Elasticsearch，类型属性与类型映射有什么区别？

Question

如果有人可以帮助理解以下两种形式的类型之间的真正区别，我将不胜感激:

使用“映射”

PUT / mybestfares_test1

{
    "mappings": {
        "bestfares_data": {
          "dynamic" : false,
            "properties": {
                "airline": {
                    "type": "string",
                    "index": "not_analyzed",
                    "null_value": "N/A"
                },
                "destinationAirport": {
                    "type": "string",
                    "index": "not_analyzed",
                    "null_value": "N/A"
                },
                "originAirport": {
                    "type": "string",
                    "index": "not_analyzed",
                    "null_value": "N/A"
                },
                "sellPrice": {
                    "type": "double",
                    "null_value": 0
                }
            }
        }
    }
}

不使用“映射”

PUT / mybestfares_test2 /

{
    "bestfares_data": {
        "dynamic" : false,
        "properties": {
            "airline": {
                "type": "string",
                "index": "not_analyzed",
                "null_value": "N/A"
            },
            "destinationAirport": {
                "type": "string",
                "index": "not_analyzed",
                "null_value": "N/A"
            },
            "originAirport": {
                "type": "string",
                "index": "not_analyzed",
                "null_value": "N/A"
            },
            "sellPrice": {
                "type": "double",
                "null_value": 0
            }
        }
    }
}

如果我获取了这两个索引的索引信息，则很明显，“mybestfares_test2”没有任何“映射”定义，尽管该类型中的每个字段都有特定的设置:

GET / mybestfares_test2 =>

{
   "mybestfares_test2": {
      "mappings": {},
      "settings": {
         "index": {
            "creation_date": "1423741207570",
            "uuid": "ognGDfnTS7i9AVE1L66UgA",
            "number_of_replicas": "1",
            "number_of_shards": "5",
            "version": {
               "created": "1040299"
            },
            "bestfares_data": {
              "dynamic" : false,
               "properties": {
                  "destinationAirport": {
                     "type": "string",
                     "null_value": "N/A",
                     "index": "not_analyzed"
                  },
                  "sellPrice": {
                     "type": "double",
                     "null_value": "0"
                  },
                  "originAirport": {
                     "type": "string",
                     "null_value": "N/A",
                     "index": "not_analyzed"
                  },
                  "airline": {
                     "type": "string",
                     "null_value": "N/A",
                     "index": "not_analyzed"
                  }
               }
            }
         }
      }
   }
}

当然，使用映射创建的索引对映射{...}部分中的字段具有相同的设置
GET / mybestfares_test1

{
   "mybestfares_test1": {
      "mappings": {
         "bestfares_data": {
          "dynamic" : false,
            "properties": {
               "airline": {
                  "type": "string",
                  "index": "not_analyzed",
                  "null_value": "N/A"
               },
               "destinationAirport": {
                  "type": "string",
                  "index": "not_analyzed",
                  "null_value": "N/A"
               },
               "originAirport": {
                  "type": "string",
                  "index": "not_analyzed",
                  "null_value": "N/A"
               },
               "sellPrice": {
                  "type": "double",
                  "null_value": 0
               }
            }
         }
      },
      "settings": {
         "index": {
            "creation_date": "1423741360578",
            "uuid": "rZ8wc2-2TGKVo8ZVd8YIKg",
            "number_of_replicas": "1",
            "number_of_shards": "5",
            "version": {
               "created": "1040299"
            }
         }
      }
   }
}

我想了解这两个索引之间有什么不同的事物(如果有的话)？

Answer 1

如果仔细查看响应，则创建的没有映射的第二个索引实际上会获得许多其他设置。因此，在这种情况下，您将不提供映射。因此，第一个是唯一正确的。