环境:
ElasticSearch版本:7.x
工具:Postman

# 索引操作

1、创建简单索引

curl -X PUT "127.0.0.1:9200/user"

索引创建成功会返回一下信息:

{
  "acknowledged" : true,
  "shards_acknowledged" : true,
  "index" : "user"
}

2、创建带有分片、映射信息的索引

curl -X PUT "127.0.0.1:9200/user"

参数:

{
    "settings": {
		"number_of_shards": 3,
		"number_of_replicas": 2
	},
    "mappings": {
        "properties": {
            "name": {
                "type": "text"
            },
            "age": {
                "type": "integer"
            },
            "isteacher": {
                "type": "boolean"
            },
            "createdate": {
                "type": "date",
                "format": "yyyy-MM-dd HH:mm:ss||yyyy-MM-dd||epoch_millis"
            }
        }
    }
}

创建了一个分片数为 3,副本数为 2 的索引,同时,里面包含了 4 个字段,类型各不相同。
用 Postman 工具来一次性创建带有映射的索引:
在这里插入图片描述

3、修改索引

3.1 修改索引副本数
curl -X PUT "127.0.0.1:9200/user/settings"

参数:

{
	"number_of_replicas": 3
}
3.2 增加索引映射字段
curl -X PUT "127.0.0.1:9200/user/_mapping"

参数:

{
    "properties": {
        "name2": {
            "type": "text"
        },
        "age2": {
            "type": "integer"
        }
    }
}

4、删除索引

curl -X DELETE  '127.0.0.1:9200/user'

5、查看索引信息

curl -X GET  '127.0.0.1:9200/user'

# 数据操作

1、填充数据

1.1 不指定数据ID

下面的示例不指定id,则返回的数据中id是随机的字符串;
不指定id,则要使用POST请求;

curl -X POST  '127.0.0.1:9200/user/_doc'

参数:

{
    "name": "jack",
    "age": 16,
    "isteacher": false,
    "createdate": "2021-06-24 20:50:32"
}

在这里插入图片描述

1.2 指定数据ID

下面的示例,是将数据的id指定为2,如果存在id为2的数据,则会被覆盖;

curl -X PUT  '127.0.0.1:9200/user/_doc/2'

参数:

{
    "name": "jack",
    "age": 16,
    "isteacher": false,
    "createdate": "2021-06-24 20:50:32"
}

在这里插入图片描述

2、删除数据

下面的示例为删除id为2的数据;

curl -X DELETE '127.0.0.1:9200/accounts/user/_doc/2'

3、更新数据

下面的示例为更新id为2的数据,如同指定id添加数据;

curl -X PUT  '127.0.0.1:9200/user/_doc/2'

参数:

{
    "name": "jack",
    "age": 16,
    "isteacher": false,
    "createdate": "2021-06-24 20:50:32"
}

返回:

{
    "_index": "user",
    "_type": "_doc",
    "_id": "2",
    "_version": 2,
    "result": "updated",
    "_shards": {
        "total": 3,
        "successful": 1,
        "failed": 0
    },
    "_seq_no": 2,
    "_primary_term": 1
}

可以看到,记录的 Id 没变,但是版本(version)从1变成2,操作类型(result)从created变成updated

4、查看数据

下面的示例为查看id为2的数据:

curl -X GET  '127.0.0.1:9200/user/_doc/2'

返回:

{
    "_index": "user",
    "_type": "_doc",
    "_id": "2",
    "_version": 2,
    "_seq_no": 2,
    "_primary_term": 1,
    "found": true,
    "_source": {
        "name": "jack",
        "age": 20,
        "isteacher": false,
        "createdate": "2021-06-24 20:50:32"
    }
}

# 数据查询

1、返回所有记录

使用 GET 方法,直接请求/Index/_search,就会返回所有记录。

curl -X GET  '127.0.0.1:9200/user/_search'
{
    "took": 2,
    "timed_out": false,
    "_shards": {
        "total": 3,
        "successful": 3,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 2,
            "relation": "eq"
        },
        "max_score": 1.0,
        "hits": [
            {
                "_index": "user",
                "_type": "_doc",
                "_id": "dkddPnoBQYnp-UDGKlgC",
                "_score": 1.0,
                "_source": {
                    "name": "jack",
                    "age": 16,
                    "isteacher": false,
                    "createdate": "2021-06-24 20:50:32"
                }
            },
            {
                "_index": "user",
                "_type": "_doc",
                "_id": "2",
                "_score": 1.0,
                "_source": {
                    "name": "jack",
                    "age": 20,
                    "isteacher": false,
                    "createdate": "2021-06-24 20:50:32"
                }
            }
        ]
    }
}

返回结果的 took字段表示该操作的耗时(单位为毫秒),timed_out字段表示是否超时,hits字段表示命中的记录,里面子字段的含义如下。

total:返回记录数,本例是2条。
max_score:最高的匹配程度,本例是1.0。
hits:返回的记录组成的数组。

2、搜索

curl -X GET  '127.0.0.1:9200/user/_search'
{
    "query": {
        "match" : {
            "name" : "lily"
        }
    }
}
{
    "took": 490,
    "timed_out": false,
    "_shards": {
        "total": 3,
        "successful": 3,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 2,
            "relation": "eq"
        },
        "max_score": 0.7549127,
        "hits": [
            {
                "_index": "user",
                "_type": "_doc",
                "_id": "3",
                "_score": 0.7549127,
                "_source": {
                    "name": "lily",
                    "age": 10,
                    "isteacher": false,
                    "createdate": "2021-06-24 20:50:32"
                }
            },
            {
                "_index": "user",
                "_type": "_doc",
                "_id": "4",
                "_score": 0.55654144,
                "_source": {
                    "name": "jack lily",
                    "age": 10,
                    "isteacher": false,
                    "createdate": "2021-06-24 20:50:32"
                }
            }
        ]
    }
}

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