具体操作可以查看官方文档
https://www.elastic.co/guide/en/elasticsearch/reference/7.5/indices.html>
官方2版本的中文文档
https://www.elastic.co/guide/cn/elasticsearch/guide/current/index-settings.html

Ⅰ： 索引初始化

#新建一个honglvliyu的索引，索引分片数量为5，索引副本数量为1
PUT honglvliyu
{
  "settings": {
    "index":{
      "number_of_shards":5,
      "number_of_replicas":1
    }
  }
}

--
{
  "acknowledged": true,
  "shards_acknowledged": true,
  "index": "honglvliyu"
}
'''
number_of_shards
每个索引的主分片数，默认值是 5 。这个配置在索引创建后不能修改。
number_of_replicas
每个主分片的副本数，默认值是 1 。对于活动的索引库，这个配置可以随时修改。
'''

Ⅱ： 查询索引配置

#获取honglvliyu索引的配置信息
GET honglvliyu/_settings

--
{
  "honglvliyu": {
    "settings": {
      "index": {
        "routing": {
          "allocation": {
            "include": {
              "_tier_preference": "data_content"
            }
          }
        },
        "number_of_shards": "5",
        "provided_name": "honglvliyu",
        "creation_date": "1700206346503",
        "number_of_replicas": "1",
        "uuid": "54QlZLFoRUmelv82cdIxWQ",
        "version": {
          "created": "8500003"
        }
      }
    }
  }
}
#获取所有索引的配置信息
GET _all/_settings
#同上
GET _settings
#获取Cat和lqz2索引的配置信息
GET cat,honglvliyu/_settings
--
{
  "honglvliyu": {
    "settings": {
      "index": {
        "routing": {
          "allocation": {
            "include": {
              "_tier_preference": "data_content"
            }
          }
        },
        "number_of_shards": "5",
        "provided_name": "honglvliyu",
        "creation_date": "1700206346503",
        "number_of_replicas": "1",
        "uuid": "54QlZLFoRUmelv82cdIxWQ",
        "version": {
          "created": "8500003"
        }
      }
    }
  },
  "cat": {
    "settings": {
      "index": {
        "routing": {
          "allocation": {
            "include": {
              "_tier_preference": "data_content"
            }
          }
        },
        "number_of_shards": "5",
        "provided_name": "cat",
        "creation_date": "1700206616250",
        "number_of_replicas": "1",
        "uuid": "tU6Ph0pwRUSppmmdEP7KNw",
        "version": {
          "created": "8500003"
        }
      }
    }
  }
}

Ⅲ： 更新索引

#修改索引副本数量为2
PUT honglvliyu/_settings
{
  "number_of_replicas": 2
}

--
{
  "acknowledged": true
}
#如遇到报错：cluster_block_exception，因为
#这是由于ES新节点的数据目录data存储空间不足，导致从master主节点接收同步数据的时候失败
#此时ES集群为了保护数据，会自动把索引分片index置为只读read-only
PUT  _all/_settings
{
"index": {
  "blocks": {
    "read_only_allow_delete": false
    }
  }
}

--
{
  "acknowledged": true
}

Ⅳ： 删除索引

#删除lqz索引
DELETE honglvliyu