es 修改 mapping 字段类型
一、原索引
PUT my_index
{
  "mappings": {
    "_doc": {
      "properties": {
        "create_date": {
          "type":   "date",
          "format": "yyyy-MM-dd ||yyyy/MM/dd"
           
        }
      }
    }
  }
} 
二、创建新索引
PUT my_index2
{
  "mappings": {
    "_doc": {
      "properties": {
        "create_date": {
          "type":   "text"
           
        }
      }
    }
  }
} 
三、同步数据
POST _reindex                   
{
  "source": {
    "index": "my_index"
  },
  "dest": {
    "index": "my_index2"
  }
} 
四、删除原索引
DELETE my_index
五、设置别名
POST /_aliases
  {
        "actions": [
            {"add": {"index": "my_index2", "alias": "my_index"}}
        ]
  } 
遇到问题: PUT my_index2 的时候,mapping没有自动生成,需要自己手动创建mapping:
先创建空的索引:
PUT /my_index2
{
} 
再创建mapping:
POST /sku_vec_32_sync2/_doc/_mapping?pretty&include_type_name=true
{
    "_doc": {
      "properties": {
        "vec": {
          "type": "dense_vector",
          "dims": 32
        }
      }
}
} 
这里要加include_type_name=true,有的版本高的 es 会判断,否则会报错误:
Types cannot be provided in put mapping requests, unless the include_type_name parameter is set to true.

