版本

springboot 2.0.4升级为2.2.2

elasticsearch 6.4升级为7.5

某些原因，需要将elasticsearch升级为7.x版本，springboot在2.2.x版本开始支持，所以这次双升级

原因

在项目用到的elasticsearch依赖如下

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
        </dependency>

model层

@Data
@Document(indexName = "user", type = "_doc", shards = 5, replicas = 1, indexStoreType = "fs", refreshInterval = "-1")
public class User {
    @Id
    private String id;

    private String name;

    @Field(type = FieldType.Date ,store = true, format = DateFormat.custom, pattern = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")
    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")
    @JsonProperty(value = "createtime")
    private Date ctime;    //创建时间

}

service层

    @Test
    public void addTest(){
        User user = new User();
        user.setId("2");
        user.setName("jimu");
        user.setCtime(new Date());
        userRepository.save(user);
    }

在执行插入操作后，发现数据可以正常插入到es中，但是插入的类型只有Id和Name，Ctime并没有插入成功,随后查看index mapping发现mapping如下：

//插入数据结果
{
  "took": 5,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": {
      "value": 1,
      "relation": "eq"
    },
    "max_score": 1,
    "hits": [
      {
        "_index": "user",
        "_type": "_doc",
        "_id": "2",
        "_score": 1,
        "_source": {
          "id": "2",
          "name": "jimu" //这里并没有我们想要的createtime
        }
      }
    ]
  }
}

//mapping
{
  "user": {
    "mappings": {
      "properties": {
        "ctime": {      //可以注意到这里创建的时ctime，但实际上应该是createtime
          "type": "date",
          "store": true,
          "format": "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"
        },
        "id": {
          "type": "text",
          "fields": {
            "keyword": {
              "type": "keyword",
              "ignore_above": 256
            }
          }
        },
        "name": {
          "type": "text",
          "fields": {
            "keyword": {
              "type": "keyword",
              "ignore_above": 256
            }
          }
        }
      }
    }
  }
}

经过测试，发现问题出在@JsonProperty(value = "createtime")这个注释上，单纯将这个对象json格式化会发现其实是生效的，但是插入es时失效，这个问题在es6.4的版本并没有出现。

解决方法

1. 如果已经有正在用的index，可以先新建index和mapping，随后用reindex将数据导入新的index中
2. 代码层面去掉@JsonProperty(value = "createtime")这个注释，可以将原ctime改为createtime

修改后代码

    @Field(type = FieldType.Date ,store = true, format = DateFormat.custom, pattern = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")
    @JsonFormat(shape = JsonFormat.Shape.STRING, pattern = "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'")
    //@JsonProperty(value = "createtime")
    private Date createtime;    //创建时间

mapping如下

{
  "user": {
    "mappings": {
      "properties": {
        "createtime": {     //此时mapping正常，数据也可以正常插入
          "type": "date",
          "store": true,
          "format": "yyyy-MM-dd'T'HH:mm:ss.SSS'Z'"
        },
        "id": {
          "type": "text",
          "fields": {
            "keyword": {
              "type": "keyword",
              "ignore_above": 256
            }
          }
        },
        "name": {
          "type": "text",
          "fields": {
            "keyword": {
              "type": "keyword",
              "ignore_above": 256
            }
          }
        }
      }
    }
  }
}

reindex

[post] http://127.0.0.1:9200/_reindex

{
  "source": {
    "index": "user"
  },
  "dest": {
    "index": "user_v2"
  }
}