1、原索引

PUT my_index
{
  "mappings": {
    "_doc": {
      "properties": {
        "create_date": {
          "type":   "date",
          "format": "yyyy-MM-dd ||yyyy/MM/dd"
        }
      }
    }
  }
}

2、创建新索引

PUT my_index2
{
  "mappings": {
    "_doc": {
      "properties": {
        "create_date": {
          "type":   "text"
        }
      }
    }
  }
}

3、同步数据

POST _reindex
{
  "source": {
    "index": "my_index"
  },
  "dest": {
    "index": "my_index2"
  }
}

4、删除原索引

DELETE my_index

5、设置别名

POST /_aliases
  {
        "actions": [
            {"add": {"index": "my_index2", "alias": "my_index"}}
        ]
  }

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