环境:
es版本:6.5.0
es创建好了mapping后是不允许修改字段类型的，要是我们想修改字段类型怎么办呢，我们可以采用reindex的方法实现，就是创建一个新的mapping，里面的字段类型按照新的类型定义，然后使用reindex的方法把原来的数据拷贝到新的index下面。
1.查看原来的mapping
[esuser@localhost ~]$ 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的字段name为text类型，我想将其修改成keyword类型
2.创建新的index和mapping
创建一个新的index
curl -u elastic:elastic -H 'Content-Type: application/json' -XPUT "http://192.168.1.85:9200/copy01_db_customer"创建一个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"}}}}
'
这里创建了一个新的index叫做opy01_db_customer，相应的tb_test mapping 字段name 为keyword类型
3.数据同步
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.再次查看新index结构
[esuser@localhost ~]$ 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}}}}}
}
