環境:
es版本:6.5.0

es建立好了mapping後是不允許修改欄位型別的，要是我們想修改欄位型別怎麼辦呢，我們可以採用reindex的方法實現，就是建立一個新的mapping，裡面的欄位型別按照新的型別定義，然後使用reindex的方法把原來的資料拷貝到新的index下面。

1.檢視原來的mapping

[[email protected] ~]$ curl -u elastic:elastic -H "Content-Type: application/json" -XGET "http://192.168.1.85:9200/db_customer/_mappings?pretty=true"
{
  
 
"db_customer" : {
    "mappings" : {
      "tb_test" : {
        "properties" : {
          "name" : {
            "type" : "text",
            "fields" : {
              "keyword" : {
                "type" : "keyword",
                "ignore_above" : 256
              }
            }
          }
        }
      }
    }
  }
}
 

可以看到tb_test的欄位name為text型別，我想將其修改成keyword型別

2.建立新的index和mapping

建立一個新的index
curl -u elastic:elastic -H 'Content-Type: application/json' -XPUT "http://192.168.1.85:9200/copy01_db_customer"

建立一個mapping
curl -u elastic:elastic -H 'Content-Type: application/json' -XPOST "http://192.168.1.85:9200/copy01_db_customer/tb_test/_mapping?pretty" -d ' 
{
    
 
"tb_test": {
            "properties": {
                "name": {
                    "type": "keyword",
                    "store": "true"
                }
            }
        }
  }
'

這裡建立了一個新的index叫做opy01_db_customer，相應的tb_test mapping 欄位name 為keyword型別

3.資料同步

curl -u elastic:elastic -X POST "192.168.1.85:9200/_reindex" -H 'Content-Type: application/json' -d'
{
  "source": {
    "index": "db_customer"
  },
  "dest": {
    "index": "copy01_db_customer"
  }
}'

4.再次檢視新index結構

[[email protected] ~]$ curl -u elastic:elastic -H "Content-Type: application/json" -XGET "http://192.168.1.85:9200/copy01_db_customer/_mappings?pretty=true"
{
  "copy01_db_customer" : {
    "mappings" : {
      "tb_test" : {
        "properties" : {
          "name" : {
            "type" : "keyword",
            "store" : true
          }
        }
      }
    }
  }
}

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