1.什么是关闭索引 
部分索引在业务中不需要使用但是又不能将其直接删除，这时可以使用关闭索引的操作使得索引
不再接收读写请求。索引被关闭后，该索引在集群中相关的内部数据也会被销毁，这有利于减少
集群的负担。如果想要使用时可以重新打开。

2.关闭索引

curl  -u elastic:elastic  -k -XPOST "http://192.168.1.800:9200/test-3-2-1/_close"
{"acknowledged":true,"shards_acknowledged":true,"indices":{"test-3-2-1":{"closed":true}}}

curl  -u elastic:elastic  -k -XGET "http://192.168.1.800:9200/test-3-2-1"
{
    "test-3-2-1":{
        "aliases":{

        },
        "mappings":{
            "properties":{
                "born":{
                    "type":"date",
                    "format":"yyyy-MM-dd HH:mm:ss"
                },
                "id":{
                    "type":"integer"
                },
                "location":{
                    "type":"geo_point"
                },
                "name":{
                    "type":"text",
                    "fields":{
                        "keyword":{
                            "type":"keyword",
                            "ignore_above":256
                        }
                    }
                },
                "sex":{
                    "type":"boolean"
                }
            }
        },
        "settings":{
            "index":{
                "routing":{
                    "allocation":{
                        "include":{
                            "_tier_preference":"data_content"
                        }
                    }
                },
                "verified_before_close":"true",      #表示索引已经关闭。
                "number_of_shards":"1",
                "provided_name":"test-3-2-1",
                "creation_date":"1743409899031",
                "number_of_replicas":"1",
                "uuid":"umYMGGMtRuON1cpFBWY7OA",
                "version":{
                    "created":"7170099"
                }
            }
        }
    }
}

--尝试写入已经关闭的索引
curl  -u elastic:elastic  -k -XPUT "http://192.168.1.800:9200/test-3-2-1/_doc/1" -H 'Content-Type: application/json' -d  '
{
 "visittime":"14:00:00",
 "keywords":"[球会2]",
 "rank":189,
 "clicknum":133,
 "id":10004,
 "userid":"sdfsdfasdfa",
 "key":"10004"
}'
{
    "error":{
        "root_cause":[
            {
                "type":"index_closed_exception",
                "reason":"closed",
                "index_uuid":"umYMGGMtRuON1cpFBWY7OA",
                "index":"test-3-2-1"
            }
        ],
        "type":"index_closed_exception",
        "reason":"closed",
        "index_uuid":"umYMGGMtRuON1cpFBWY7OA",
        "index":"test-3-2-1"
    },
    "status":400
}


3.打开索引并查看 
curl  -u elastic:elastic  -k -XPOST "http://192.168.1.800:9200/test-3-2-1/_open"


{
    "test-3-2-1":{
        "aliases":{

        },
        "mappings":{
            "properties":{
                "born":{
                    "type":"date",
                    "format":"yyyy-MM-dd HH:mm:ss"
                },
                "id":{
                    "type":"integer"
                },
                "location":{
                    "type":"geo_point"
                },
                "name":{
                    "type":"text",
                    "fields":{
                        "keyword":{
                            "type":"keyword",
                            "ignore_above":256
                        }
                    }
                },
                "sex":{
                    "type":"boolean"
                }
            }
        },
        "settings":{
            "index":{
                "routing":{
                    "allocation":{
                        "include":{
                            "_tier_preference":"data_content"
                        }
                    }
                },                   #原先有这个参数:"verified_before_close":"true",索引打开后没有了。
                "number_of_shards":"1",
                "provided_name":"test-3-2-1",
                "creation_date":"1743409899031",
                "number_of_replicas":"1",
                "uuid":"umYMGGMtRuON1cpFBWY7OA",
                "version":{
                    "created":"7170099"
                }
            }
        }
    }
}