es不支持直接修改字段类型，解决思路：

1. 新建临时索引，执行字段类型，复制数据
2. 删除旧索引，重建同名索引，从临时索引复制数据

举例:
我这有个学生的索引:

{
	"properties": {
		"name": {
			"type": "text",
			"index": true
		},
        "nickname": {
			"type": "text",
			"index": true
		},
		"sex": {
			"type": "text",
			"index": false
		},
		"age": {
			"type": "long",
			"index": false
		}
	}
}

在 Postman 中，向 ES 服务器发 GET 请求 ：http://127.0.0.1:9200/student/_mapping查看索引

服务器响应结果:

我想要把sex、age的index设置为true

1、获取旧索引的字段映射

GET /users/_mapping

2、创建临时索引带映射

PUT: http://127.0.0.1:9200/student_temp

服务器响应结果:

然后正确的创建映射
PUT: http://127.0.0.1:9200/student_temp/_mapping

{
	"properties": {
		"name": {
			"type": "text",
			"index": true
		},
        "nickname": {
			"type": "text",
			"index": true
		},
		"sex": {
			"type": "text",
			"index": true
		},
		"age": {
			"type": "long",
			"index": true
		}
	}
}

响应结果：

3、复制数据

POST: http://127.0.0.1:9200/_reindex

{
  "source": {
    "index": "student"
  }, 
  "dest": {
    "index": "student_temp"
  }
}

4、删除旧索引

DELETE: http://127.0.0.1:9200/student

5、创建新的正确的索引带映射

1. PUT:http://127.0.0.1:9200/student
2. PUT: http://127.0.0.1:9200/student_/_mapping

{
	"properties": {
		"name": {
			"type": "text",
			"index": true
		},
        "nickname": {
			"type": "text",
			"index": true
		},
		"sex": {
			"type": "text",
			"index": true
		},
		"age": {
			"type": "long",
			"index": true
		}
	}
}

6、复制数据

POST http://127.0.0.1:9200/_reindex

查看数据：
Get请求：http://127.0.0.1:9200/student/_search

{
 "query": {
 	"match_all": {}
 }
}

7、删除临时索引就欧克啦

DELETE请求： http://127.0.0.1:9200/student_temp