ElasticSearch 7.x

Elasticsearch 7.x

簡介

Elasticsearch是一個開源揪利，基于Apache Lucene庫構(gòu)建的Restful搜索引擎
Elasticsearch是在Solr之后幾年推出的符糊。它提供了一個分布式，多租戶能力的全文搜索引擎，具有HTTP Web界面（REST）和無架構(gòu)JSON文檔。 Elasticsearch的官方客戶端庫提供Java， Groovy， PHP鳞青， Ruby， Perl为朋， Python臂拓， .NET和Javascript

官網(wǎng)地址

[官網(wǎng)]https://www.elastic.co/
[軟件下載地址]https://www.elastic.co/downloads/

核心概念

索引(index)
- 一個索引可以理解成一個關(guān)系型數(shù)據(jù)庫
類型(type)
- 一種type就像一類表，比如user表习寸， order表
- 注意：
  - ES 5.x中一個index可以有多種type
  - ES 6.x中一個index只能有一種type
  - ES 7.x以后已經(jīng)移除type這個概念
映射(mapping)
- mapping定義了每個字段的類型等信息胶惰。相當(dāng)于關(guān)系型數(shù)據(jù)庫中的表結(jié)構(gòu)
文檔(document)
- 一個document相當(dāng)于關(guān)系型數(shù)據(jù)庫中的一行記錄
字段(field)
- 相當(dāng)于關(guān)系型數(shù)據(jù)庫表的字段
集群(cluster)
- 集群由一個或多個節(jié)點組成，一個集群有一個默認(rèn)名稱"elasticsearch"
節(jié)點(node)
- 集群的節(jié)點霞溪，一臺機?或者一個進程
分片和副本(shard)
- 副本是分片的副本孵滞。分片有主分片(primary Shard)和副本分片(replica Shard)之分
- 一個Index數(shù)據(jù)在物理上被分布在多個主分片中，每個主分片只存放部分?jǐn)?shù)據(jù)
- 每個主分片可以有多個副本鸯匹，叫副本分片坊饶，是主分片的復(fù)制

字段類型

核心數(shù)據(jù)類型

分類	類型	描述
字符串	text	用于全文索引，該類型的字段將通過分詞?進行分詞
字符串	keyword	不分詞殴蓬，只能搜索該字段的完整的值
數(shù)值型	long, integer, short, byte, double, float, half_float, scaled_float	-
布爾	boolean	-
二進制	binary	該類型的字段把值當(dāng)做經(jīng)過 base64 編碼的字符串匿级，默認(rèn)不存儲，且不可搜索
范圍類型	integer_range, float_range, long_range, double_range, date_range	范圍類型表示值是一個范圍，而不是一個具體的值痘绎；譬如 age 的類型是 integer_range津函，那么值可以是 {"gte" : 20, "lte" : 40}；搜索 "term" :{"age": 21} 可以搜索該值
日期	date	由于Json沒有date類型孤页，所以es通過識別字符串是否符合format定義的格式來判斷是否為date類型尔苦；format默認(rèn)為strict_date_optiona_time\|\|epoch_millis；格式"2022-01-01"散庶，"2022/01/01 12:10:30"，或從開始紀(jì)元（1970年年1? 1?日 0點）開始的毫秒數(shù)

復(fù)雜數(shù)據(jù)類型

數(shù)組類型 Array
- ES中沒有專門的數(shù)組類型, 直接使用[]定義即可凌净，數(shù)組中所有的值必須是同一種數(shù)據(jù)類型, 不支持混合數(shù)據(jù)類型的數(shù)組
- 字符串?dāng)?shù)組 [ "one", "two" ] 悲龟，整數(shù)數(shù)組 [ 1, 2 ]
- Object對象數(shù)組 [ { "name": "Louis", "age": 18 }, { "name": "Daniel", "age": 17 }]
- 同一個數(shù)組只能存同類型的數(shù)據(jù)，不能混存冰寻，譬如 [ 10, "some string" ] 是錯誤的

對象類型 Object

對象類型可能有內(nèi)部對象

{
    "name": "李蒙",
    "age": 14,
    "sex": "0",
    "class": "7(2)班",
    "birthday": "2005-10-15"
    "hobbies": [
        "閱讀",
        "跑步"
    ],
    "address":
    {
        "province": "山東",
        "location":
        {
            "city": "日照"
        }
    }
}

專?用數(shù)據(jù)類型

IP類型

IP類型的字段?用于存儲IPv4或IPv6的地址, 本質(zhì)上是?一個?長整型字段

索引

功能	請求方式	url	參數(shù)
新增	PUT(必須)	localhost:9200/stu	-
獲取	GET	localhost:9200/stu	-
刪除	DELETE	localhost:9200/stu	-
批量獲取	GET	localhost:9200/stu,tea	-
獲取所有1	GET	localhost:9200/_all	-
獲取所有2	GET	localhost:9200/_cat/indices?v	-
存在	HEAD	localhost:9200/stu	-
關(guān)閉	POST	localhost:9200/stu/_close	-
打開	POST	localhost:9200/stu/_open	-
自動創(chuàng)建索引	PUT	localhost:9200/_cluster/settings	見下
數(shù)據(jù)復(fù)制	POST	localhost:9200/_reindex	見下

新增

PUT localhost:9200/stu

// 響應(yīng)
{
    "acknowledged": true,
    "shards_acknowledged": true,
    "index": "stu"
}

獲取

GET localhost:9200/stu

// 響應(yīng)
{
    "stu": {
        "aliases": {},//別名
        "mappings": {},//映射
        "settings": {
            "index": {
                "creation_date": "1576139082806",//創(chuàng)建時間
                "number_of_shards": "1",//分片
                "number_of_replicas": "1",//副本
                "uuid": "-ocQkbgoSyG2vDTsugK_9Q",
                "version": {
                    "created": "7020099"
                },
                "provided_name": "stu"
            }
        }
    }
}

刪除

DELETE localhost:9200/stu
```
{
    "acknowledged": true
}
```

批量獲取

GET localhost:9200/stu,tea

// 響應(yīng)
{
    "stu": {
        "aliases": {},
        "mappings": {},
        "settings": {
            "index": {
                "creation_date": "1576139586417",
                "number_of_shards": "1",
                "number_of_replicas": "1",
                "uuid": "H9dyTutEQg-4OsV2Byt-gA",
                "version": {
                    "created": "7020099"
                },
                "provided_name": "stu"
            }
        }
    },
    "tea": {
        "aliases": {},
        "mappings": {},
        "settings": {
            "index": {
                "creation_date": "1576139593175",
                "number_of_shards": "1",
                "number_of_replicas": "1",
                "uuid": "nYhKuggbT_Wa2RI-M_COGA",
                "version": {
                    "created": "7020099"
                },
                "provided_name": "tea"
            }
        }
    }
}

獲取所有1

GET localhost:9200/_all

// 響應(yīng)
{
    "stu": {
        "aliases": {},
        "mappings": {},
        "settings": {
            "index": {
                "creation_date": "1576139586417",
                "number_of_shards": "1",
                "number_of_replicas": "1",
                "uuid": "H9dyTutEQg-4OsV2Byt-gA",
                "version": {
                    "created": "7020099"
                },
                "provided_name": "stu"
            }
        }
    },
    "tea": {
        "aliases": {},
        "mappings": {},
        "settings": {
            "index": {
                "creation_date": "1576139593175",
                "number_of_shards": "1",
                "number_of_replicas": "1",
                "uuid": "nYhKuggbT_Wa2RI-M_COGA",
                "version": {
                    "created": "7020099"
                },
                "provided_name": "tea"
            }
        }
    }
}

獲取所有2

GET localhost:9200/_cat/indices?v

// 響應(yīng)
health status index                           uuid                   pri rep docs.count docs.deleted store.size pri.store.size
green  open   .kibana_task_manager            IjZxE0H9TtmTrpBgzjr-qg   1   0          2            0     12.8kb         12.8kb
yellow open   stu                             H9dyTutEQg-4OsV2Byt-gA   1   1          0            0       283b           283b
yellow open   tea                             nYhKuggbT_Wa2RI-M_COGA   1   1          0            0       283b           283b

存在

HEAD localhost:9200/stu
```
// 響應(yīng)-存在
200 ok
```

關(guān)閉

POST localhost:9200/stu/_close

// 響應(yīng)
{
    "acknowledged": true,
    "shards_acknowledged": true
}

打開

POST localhost:9200/stu/_open

// 響應(yīng)
{
    "acknowledged": true,
    "shards_acknowledged": true
}

自動創(chuàng)建索引

插入文檔時（見下）是否自動創(chuàng)建索引

GET 請求http://localhost:9200/_cluster/settings 查看auto_create_index 的狀態(tài)

true自動創(chuàng)建
- 修改auto_create_index 的狀態(tài)
  
  PUT localhost:9200/_cluster/settings
```
// 參數(shù)
{
    "persistent": {
        "action.auto_create_index": "true"http://true或false
    }
}
```
數(shù)據(jù)復(fù)制（結(jié)合索引別名须教，可以重建索引并導(dǎo)入數(shù)據(jù)）

POST localhost:9200/_reindex
```
{
  "source": {
    "index": "stu"
  },
  "dest": {
    "index": "stu_oth"
  }
}
```

索引別名

在開發(fā)中，隨著業(yè)務(wù)需求的迭代斩芭，較?的業(yè)務(wù)邏輯就要?臨更新甚?是重構(gòu)轻腺，?對于es來說，為了適應(yīng)新的業(yè)務(wù)邏輯划乖，可能就要對原有的索引做?些修改贬养，?如對某些字段做調(diào)整，甚?是重建索引琴庵。?做這些操作的時候误算，可能會對業(yè)務(wù)造成影響，甚?是停機調(diào)整等問題迷殿。由此儿礼，es提供了索引別名來解決這些問題。索引別名就像?個快捷?式或是軟連接庆寺，可以指向?個或多個索引蚊夫，也可以給任意?個需要索引名的API來使?。別名的應(yīng)?為程序提供了極?地靈活性

多個索引可以指定同一個別名懦尝，一個索引也可以指定多個別名

功能	請求方式	url	參數(shù)
查詢	GET	localhost:9200/_alias; localhost:9200/stu/_alias	-
新增	POST	localhost:9200/_aliases	見下
新增	PUT	localhost:9200/stu/_alias/stu_v1.0	-
刪除	POST	localhost:9200/_aliases	見下
刪除	DELETE	localhost:9200/stu/_alias/stu_v1.0	-
重命名	POST	localhost:9200/_aliases	見下

新增

POST localhost:9200/_aliases

{
  "actions": [
    {
      "add": {
        "index": "stu",
        "alias": "stu_1214"
      }
    }
  ]
}

刪除

POST localhost:9200/_aliases

{
  "actions": [
    {
      "remove": {
        "index": "stu",
        "alias": "stu_v1.1"
      }
    }
  ]
}

重命名

POST localhost:9200/_aliases

{
  "actions": [
    {
      "remove": {
        "index": "stu",
        "alias": "stu_1214"
      }
    },
    {
      "add": {
        "index": "stu",
        "alias": "stu_1215"
      }
    }
  ]
}

當(dāng)別名指定了多個索引知纷，可以指定寫某個索引

POST localhost:9200/_aliases

{
  "actions": [
    {
      "add": {
        "index": "stu",
        "alias": "alia_v1.0",
        "is_write_index": "true"
      }
    },
    {
      "add": {
        "index": "tea",
        "alias": "alia_v1.0"
      }
    }
  ]
}

映射

功能	請求方式	url	參數(shù)
新增	PUT	localhost:9200/stu/_mapping	見下
獲取	GET	localhost:9200/stu/_mapping	-
批量獲取	GET	localhost:9200/stu,tea/_mapping	-
獲取所有1	GET	localhost:9200/_mapping	-
獲取所有2	GET	localhost:9200/_all/_mapping	-
修改	PUT	localhost:9200/stu/_mapping	見下

新增

PUT localhost:9200/stu/_mapping

// 參數(shù)
{
    "properties":
    {
        "name":
        {
            "type": "text"
        },
        "age": {
            "type": "long"
        },
        "sex": {
            "type": "keyword"
        },
        "class": {
            "type": "keyword"
        }
    }
}

獲取

GET localhost:9200/stu/_mapping

// 響應(yīng)
{
    "stu": {
        "mappings": {
            "properties": {
                "age": {
                    "type": "long"
                },
                "class": {
                    "type": "keyword"
                },
                "name": {
                    "type": "text"
                },
                "sex": {
                    "type": "keyword"
                }
            }
        }
    }
}

批量獲取

GET localhost:9200/stu,tea/_mapping

// 響應(yīng)
{
    "tea": {
        "mappings": {}
    },
    "stu": {
        "mappings": {
            "properties": {
                "age": {
                    "type": "long"
                },
                "class": {
                    "type": "keyword"
                },
                "name": {
                    "type": "text"
                },
                "sex": {
                    "type": "keyword"
                }
            }
        }
    }
}

獲取所有1

GET localhost:9200/_mapping

// 響應(yīng)
{
    "stu": {
        "mappings": {
            "properties": {
                "age": {
                    "type": "long"
                },
                "class": {
                    "type": "keyword"
                },
                "name": {
                    "type": "text"
                },
                "sex": {
                    "type": "keyword"
                }
            }
        }
    },
    "tea": {
        "mappings": {}
    },
}

獲取所有2

GET localhost:9200/_all/_mapping

// 響應(yīng)
{
    "stu": {
        "mappings": {
            "properties": {
                "age": {
                    "type": "long"
                },
                "class": {
                    "type": "keyword"
                },
                "name": {
                    "type": "text"
                },
                "sex": {
                    "type": "keyword"
                }
            }
        }
    },
    "tea": {
        "mappings": {}
    },
}

修改

注意：

修改映射時，只能新增字段陵霉，不能修改或刪除已存在的字段

PUT localhost:9200/stu/_mapping

// 參數(shù)
{
    "properties":
    {
        "name":
        {
            "type": "text"
        },
        "age": {
            "type": "long"
        },
        "sex": {
            "type": "keyword"
        },
        "class": {
            "type": "keyword"
        },
        "birthday": {
            "type": "date"
        }
    }
}

文檔

功能	請求方式	url	參數(shù)
新增(指定id)	PUT	localhost:9200/stu/_doc/1	見下
新增(不指定id)	POST(必須)	localhost:9200/stu/_doc	見下
指定操作類型	PUT	localhost:9200/stu/_doc/1?op_type=create	見下
查看	GET	localhost:9200/stu/_doc/1	-
查看多個?文檔	POST	localhost:9200/_mget	見下
修改	POST	localhost:9200/stu/_update/1	見下
刪除	DELETE	localhost:9200/stu/_doc/1	-
刪除全部	POST	localhost:9200/stu/_delete_by_query

新增(指定id)

PUT localhost:9200/stu/_doc/1

// 參數(shù)
{
    "name": "楊光",
    "age": 14,
    "sex": "1",
    "class": "7(2)班",
    "birthday": "2005-08-26"
}

// 響應(yīng)
{
    "_index": "stu",
    "_type": "_doc",
    "_id": "1",
    "_version": 1,
    "result": "created",
    "_shards": {
        "total": 2,
        "successful": 1,
        "failed": 0
    },
    "_seq_no": 0,
    "_primary_term": 3
}

新增(不指定id)

不指定id屈扎，系統(tǒng)會自動分配id

POST localhost:9200/stu/_doc

// 參數(shù)
{
    "name": "張世杰",
    "age": 13,
    "sex": "0",
    "class": "7(5)班",
    "birthday": "2004-11-01"
}

// 響應(yīng)
{
    "_index": "stu",
    "_type": "_doc",
    "_id": "C_SI-W4Bj7nk6pLmw4Er",//系統(tǒng)分配id
    "_version": 1,
    "result": "created",
    "_shards": {
        "total": 2,
        "successful": 1,
        "failed": 0
    },
    "_seq_no": 1,
    "_primary_term": 3
}

指定操作類型

若不指定插入時的操作類型，向已存在的id插入數(shù)據(jù)撩匕，原數(shù)據(jù)會被更新掉鹰晨，并生成一個新的版本

PUT localhost:9200/stu/_doc/1
{
 "name": "楊光11",
 "age": 14,
 "sex": "1",
 "class": "7(2)班",
 "birthday": "2005-08-26"
}
{
 "_index": "stu",
 "_type": "_doc",
 "_id": "1",
 "_version": 2,//產(chǎn)生新的版本
 "result": "updated",//執(zhí)行結(jié)果時updated，而不是created
 "_shards": {
     "total": 2,
     "successful": 1,
     "failed": 0
 },
 "_seq_no": 2,
 "_primary_term": 3
}

PUT localhost:9200/stu/_doc/1?op_type=create (向已存在的id插入數(shù)據(jù)會報錯)

// 參數(shù)
{
    "name": "楊光22",
    "age": 14,
    "sex": "1",
    "class": "7(2)班",
    "birthday": "2005-08-26"
}

// 響應(yīng)
{
    "error": {
        "root_cause": [
            {
                "type": "version_conflict_engine_exception",
                "reason": "[1]: version conflict, document already exists (current version [2])",
                "index_uuid": "H9dyTutEQg-4OsV2Byt-gA",
                "shard": "0",
                "index": "stu"
            }
        ],
        "type": "version_conflict_engine_exception",
        "reason": "[1]: version conflict, document already exists (current version [2])",
        "index_uuid": "H9dyTutEQg-4OsV2Byt-gA",
        "shard": "0",
        "index": "stu"
    },
    "status": 409
}

查看

GET localhost:9200/stu/_doc/1

// 響應(yīng)
{
    "_index": "stu",
    "_type": "_doc",
    "_id": "1",
    "_version": 2,
    "_seq_no": 2,
    "_primary_term": 3,
    "found": true,
    "_source": {
        "name": "楊光11",
        "age": 14,
        "sex": "1",
        "class": "7(2)班",
        "birthday": "2005-08-26"
    }
}

查看多個?文檔

方式一

POST localhost:9200/_mget

// 參數(shù)
{
    "docs": [
    {
        "_index": "stu",
        "_type": "_doc",
        "_id": "1"
    },
    {
        "_index": "stu",
        "_type": "_doc",
        "_id": "C_SI-W4Bj7nk6pLmw4Er"
    }]
}

// 響應(yīng)
{
    "docs": [
        {
            "_index": "stu",
            "_type": "_doc",
            "_id": "1",
            "_version": 3,
            "_seq_no": 3,
            "_primary_term": 3,
            "found": true,
            "_source": {
                "name": "楊光33",
                "age": 14,
                "sex": "1",
                "class": "7(2)班",
                "birthday": "2005-08-26"
            }
        },
        {
            "_index": "stu",
            "_type": "_doc",
            "_id": "C_SI-W4Bj7nk6pLmw4Er",
            "_version": 1,
            "_seq_no": 1,
            "_primary_term": 3,
            "found": true,
            "_source": {
                "name": "張世杰",
                "age": 13,
                "sex": "0",
                "class": "7(5)班",
                "birthday": "2004-11-01"
            }
        }
    ]
}

方式二

POST localhost:9200/stu/_mget

// 參數(shù)
{
    "docs": [
    {
        "_type": "_doc",
        "_id": "1"
    },
    {
        "_type": "_doc",
        "_id": "C_SI-W4Bj7nk6pLmw4Er"
    }]
}

方式三

POST localhost:9200/stu/_doc/_mget

// 參數(shù)
{
    "docs": [
    {
        "_id": "1"
    },
    {
        "_id": "C_SI-W4Bj7nk6pLmw4Er"
    }]
}

修改

根據(jù)提供的?文檔?片段更更新數(shù)據(jù)

POST localhost:9200/stu/_update/1

// 參數(shù)
{
    "doc": {
        "name": "楊光33",
        "age": 14,
        "sex": "1",
        "class": "7(2)班",
        "birthday": "2005-08-26"
    }
}

向_source字段，增加一個字段

POST localhost:9200/stu/_update/1
```
// 參數(shù)
{
   "script": "ctx._source.height = \"173cm\""
}
```
從_source字段模蜡，刪除一個字段

POST localhost:9200/stu/_update/1
```
// 參數(shù)
{
   "script": "ctx._source.remove(\"height\")"
}
```

刪除

DELETE localhost:9200/stu/_doc/1

// 響應(yīng)
{
    "_index": "stu",
    "_type": "_doc",
    "_id": "1",
    "_version": 6,
    "result": "deleted",
    "_shards": {
        "total": 2,
        "successful": 1,
        "failed": 0
    },
    "_seq_no": 6,
    "_primary_term": 3
}

刪除全部

POST localhost:9200/stu/_delete_by_query

// 參數(shù)
{
    "query": {
        "match_all": {
            
        }
    }   
}

查詢搜索

數(shù)據(jù)準(zhǔn)備：批量導(dǎo)入數(shù)據(jù)-ES提供了一個叫 bulk 的API 來進行批量操作

數(shù)據(jù)

{"index": {"_index": "stu", "_type": "_doc", "_id": 1}}
{"name":"楊光","age":14,"sex":"1","class":"7(2)班","birthday":"2005-08-26"}
{"index": {"_index": "stu", "_type": "_doc", "_id": 2}}
{"name":"張世杰","age":13,"sex":"0","class":"7(5)班","birthday":"2004-11-01"}
{"index": {"_index": "stu", "_type": "_doc", "_id": 3}}
{"name":"李蒙","age":14,"sex":"0","class":"7(2)班","birthday":"2005-10-15"}
{"index": {"_index": "stu", "_type": "_doc", "_id": 4}}
{"name":"李沁","age":15,"sex":"0","class":"7(3)班","birthday":"2004-10-15"}
{"index": {"_index": "stu", "_type": "_doc", "_id": 5}}
{"name":"王昭","age":14,"sex":"1","class":"7(3)班","birthday":"2005-01-26"}
{"index": {"_index": "stu", "_type": "_doc", "_id": 6}}
{"name":"李明","age":14,"sex":"1","class":"7(2)班","birthday":"2005-03-26"}
{"index": {"_index": "stu", "_type": "_doc", "_id": 7}}
{"name":"張璐","age":14,"sex":"1","class":"7(5)班","birthday":"2005-06-02"}
{"index": {"_index": "stu", "_type": "_doc", "_id": 8}}
{"name":"李思敏","age":14,"sex":"1","class":"7(3)班","birthday":"2005-06-02"}
{"index": {"_index": "stu", "_type": "_doc", "_id": 9}}
{"name":"吳民錫","age":13,"sex":"1","class":"7(5)班","birthday":"2006-04-02"}
{"index": {"_index": "stu", "_type": "_doc", "_id": 10}}
{"name":"趙曦","age":14,"sex":"0","class":"7(2)班","birthday":"2005-09-02"}

POST bulk

curl -X POST "localhost:9200/_bulk" -H 'Content-Type: application/json' --data-binary @name

term(詞條)查詢

單詞級別查詢-詞條查詢不會分析查詢條件漠趁，只有當(dāng)詞條和查詢字符串完全匹配時，才匹配搜索忍疾；這些查詢通常用于結(jié)構(gòu)化的數(shù)據(jù)闯传，比如： number, date, keyword等，而不是對text卤妒。也就是說甥绿，全文本查詢之前要先對文本內(nèi)容進行分詞，而單詞級別的查詢直接在相應(yīng)字段的反向索引中精確查找则披，單詞級別的查詢一般用于數(shù)值共缕、日期等類型的字段上。

功能	請求方式	url	參數(shù)	描述
單條term查詢	POST	localhost:9200/stu/_search	見下	-
多條term查詢	POST	localhost:9200/stu/_search	見下	-
Exsit Query	POST	localhost:9200/stu/_search	見下	特定的字段中查找?非空值的?文檔
Prefix Query	POST	localhost:9200/stu/_search	見下	查找包含帶有指定前綴term的?文檔
Wildcard Query	POST	localhost:9200/stu/_search	見下	支持通配符查詢士复， *表示任意字符图谷， ?表示任意單個字符
Regexp Query	POST	localhost:9200/stu/_search	見下	正則表達式查詢
Ids Query	POST	localhost:9200/stu/_search	見下	通過id查詢文檔

單條term查詢

POST localhost:9200/stu/_search

// 參數(shù)
{
    "query":{
        "term":{
            "sex": "1"
        }
    }
}

// 響應(yīng)
{
    "took": 1,
    "timed_out": false,
    "_shards": {
        "total": 1,
        "successful": 1,
        "skipped": 0,
        "failed": 0
    },
    "hits": {
        "total": {
            "value": 1,
            "relation": "eq"
        },
        "max_score": 0.9808292,
        "hits": [
            {
                "_index": "stu",
                "_type": "_doc",
                "_id": "1",
                "_score": 0.9808292,
                "_source": {
                    "name": "楊光",
                    "age": 14,
                    "sex": "1",
                    "class": "7(2)班",
                    "birthday": "2005-08-26"
                }
            }
        ]
    }
}

多條term查詢

POST localhost:9200/stu/_search

// 參數(shù)
{
    "query":{
        "terms":{
            "sex": ["0","1"]
        }
    }
}

Exsit Query

POST localhost:9200/stu/_search

// 參數(shù)
{
  "query": {
    "exists": {
      "field": "birthday"
    }
  }
}

Prefix Query

POST localhost:9200/stu/_search

// 參數(shù)
{
  "query": {
    "prefix": {
      "class": {
        "value": "7"
      }
    }
  }
}

Wildcard Query

POST localhost:9200/stu/_search

// 參數(shù)
{
  "query": {
    "wildcard": {
      "class": {
        "value": "*2*"
      }
    }
  }
}

Regexp Query

POST localhost:9200/stu/_search

// 參數(shù)
{
  "query": {
    "regexp": {
      "class": "7.*"
    }
  }
}

Ids Query

POST localhost:9200/stu/_search

// 參數(shù)
{
  "query": {
    "ids": {
      "values": [1,2]
    }
  }
}

full text(全文)查詢

ElasticSearch引擎會先分析查詢字符串，將其拆分成多個分詞阱洪，只要已分析的字段中包含詞條的任意一個便贵，或全部包含，就匹配查詢條件冗荸，返回該文檔承璃；如果不包含任意一個分詞，表示沒有任何?文檔匹配查詢條件

類型	請求方式	url	參數(shù)	描述
match_all	POST	localhost:9200/stu/_search	見下	查詢?nèi)?/td>
match	POST	localhost:9200/stu/_search	見下	分詞匹配查詢
multi_match	POST	localhost:9200/stu/_search	見下	多字段查詢
match_phrase	POST	localhost:9200/stu/_search	見下	精確匹配
match_phrase_prefix	POST	localhost:9200/stu/_search	見下	模糊匹配（text）

match_all

POST localhost:9200/nba/_search

// 參數(shù)
{
    "query":{
        "match_all":{}
    },
    "from": 0,
    "size": 10
}

match

POST localhost:9200/nba/_search

// 參數(shù)
{
  "query": {
    "match": {
      "name": "張"
    }
  }
}

multi_match

POST localhost:9200/nba/_search

// 參數(shù)
{
  "query": {
    "multi_match": {
      "query": "世",// 查詢條件
      "fields": ["name","class"]//查詢哪些字段
    }
  }
}

match_phrase

POST localhost:9200/nba/_search

// 參數(shù)
{
  "query": {
    "match_phrase": {
      "class": "7(2)班"
    }
  }
}

match_phrase_prefix

// 參數(shù)
{
  "query": {
    "match_phrase_prefix": {
      "name": "世杰"
    }
  }
}

范圍查詢

范圍查詢--日期蚌本、數(shù)字或字符串

POST localhost:9200/nba/_search

// 查詢年齡14-15歲的學(xué)生
{
  "query": {
    "range": {
      "age": {
        "gte": 14,
        "lte": 15
      }
    }
  }
}

// 查詢2003年到2004年出生的學(xué)生
{
  "query": {
    "range": {
      "birthday": {
        "gte": "2003",
        "lte": "31-12-2004",
        "format": "dd-MM-yyyy||yyyy"
      }
    }
  }
}

布爾查詢

類型	請求方式	url	參數(shù)	描述
must	POST	localhost:9200/nba/_search	見下	必須出現(xiàn)在匹配文檔中
filter	POST	localhost:9200/nba/_search		必須出現(xiàn)在文檔中绸硕，但是不打分
must_not	POST	localhost:9200/nba/_search		不能出現(xiàn)在文檔中
should	POST	localhost:9200/nba/_search		應(yīng)該出現(xiàn)在文檔中

must

POST localhost:9200/nba/_search

// 查詢sex為"0"，name中含有"曦"的學(xué)生
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "name": "曦"
          }
        },
        {
          "term": {
            "sex": {
              "value": "0"
            }
          }
        }
      ]
    }
  }
}

// 響應(yīng)
{
  "took" : 1,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 2.9985561,
    "hits" : [
      {
        "_index" : "stu",
        "_type" : "_doc",
        "_id" : "10",
        "_score" : 2.9985561,// 分?jǐn)?shù)
        "_source" : {
          "name" : "趙曦",
          "age" : 14,
          "sex" : "0",
          "class" : "7(2)班",
          "birthday" : "2005-09-02"
        }
      }
    ]
  }
}

filter

效果同must魂毁，但是不打分

POST localhost:9200/nba/_search

{
  "query": {
    "bool": {
      "filter": [
        {
          "match": {
            "name": "曦"
          }
        },
        {
          "term": {
            "sex": {
              "value": "0"
            }
          }
        }
      ]
    }
  }
}

must_not

POST localhost:9200/nba/_search

// 查詢name包含"張",sex不是"0"的學(xué)生
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "name": "張"
          }
        }
      ],
      "must_not": [
        {
          "term": {
            "sex": {
              "value": "0"
            }
          }
        }
      ]
    }
  }
}

should

POST localhost:9200/nba/_search

// 查詢sex為"1"的學(xué)生
{
  "query": {
    "bool": {
      "should": [
        {
          "term": {
            "sex": {
              "value": "1"
            }
          }
        }
      ]
    }
  }
}

與其他模式結(jié)合使用時即使匹配不到也返回玻佩，只是評分不同

// 查詢name中包含"李",age在13-14之間的學(xué)生
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "name": "李"
          }
        }
      ],
      "should": [
        {
          "range": {
            "age": {
              "gte": 13,
              "lte": 14
            }
          }
        }
      ]
    }
  }
}

排序查詢

POST localhost:9200/nba/_search

// 查詢7(5)班學(xué)生，age倒序排列
{
  "query": {
    "term": {
      "class": {
        "value": "7(5)班"
      }
    }
  },
  "sort": [
    {
      "age": {
        "order": "desc"
      }
    }
  ]
}

聚合查詢

聚合分析是數(shù)據(jù)庫中重要的功能特性席楚，完成對一個查詢的數(shù)據(jù)集中數(shù)據(jù)的聚合計算咬崔，如：找出某字段（或計算表達式的結(jié)果）的最大值、最小值烦秩，計算和垮斯、平均值等。 ES作為搜索引擎兼數(shù)據(jù)庫只祠，同樣提供了強大的聚合分析能力
對一個數(shù)據(jù)集求最大兜蠕、最小、和抛寝、平均值等指標(biāo)的聚合熊杨，在ES中稱為指標(biāo)聚合
而關(guān)系型數(shù)據(jù)庫中除了有聚合函數(shù)外曙旭，還可以對查詢出的數(shù)據(jù)進行分組group by，再在組上進行指標(biāo)聚合晶府。在ES中稱為桶聚合

指標(biāo)聚合

max min sum avg

POST localhost:9200/nba/_search

// max-7(3)班最大年齡
{
  "query": {
    "term": {
      "class": {
        "value": "7(3)班"
      }
    }
  },
  "aggs": {
    "maxAge": {// 自定義名稱
      "max": {
        "field": "age"
      }
    }
  },
  "size": 0
}

// min-7(3)班最小年齡
{
  "query": {
    "term": {
      "class": {
        "value": "7(3)班"
      }
    }
  },
  "aggs": {
    "minAge": {
      "min": {
        "field": "age"
      }
    }
  },
  "size": 0
}

// sum
{
  "query": {
    "term": {
      "class": {
        "value": "7(3)班"
      }
    }
  },
  "aggs": {
    "sumAge": {
      "sum": {
        "field": "age"
      }
    }
  }, 
  "size": 0
}

// avg-7(3)班平均年齡
{
  "query": {
    "term": {
      "class": {
        "value": "7(3)班"
      }
    }
  },
  "aggs": {
    "avgAge": {// 自定義名稱
      "avg": {
        "field": "age"
      }
    }
  },
  "size": 0
}

value_count

統(tǒng)計非空字段的文檔數(shù)

POST localhost:9200/nba/_search

// 查詢7(3)班年齡非空的學(xué)生總數(shù)
{
  "query": {
    "term": {
      "class": {
        "value": "7(3)班"
      }
    }
  },
  "aggs": {
    "countAge": {
      "value_count": {
        "field": "age"
      }
    }
  }, 
  "size": 0
}

Cardinality

值去重計數(shù)

POST localhost:9200/nba/_search

// 7(3)班age去重統(tǒng)計
{
  "query": {
    "term": {
      "class": {
        "value": "7(3)班"
      }
    }
  },
  "aggs": {
    "cardinalityAge": {
      "cardinality": {
        "field": "age"
      }
    }
  }, 
  "size": 0
}

stats

統(tǒng)計count max min avg sum 5個值

POST localhost:9200/nba/_search

{
  "query": {
    "term": {
      "class": {
        "value": "7(3)班"
      }
    }
  },
  "aggs": {
    "statsAge": {
      "stats": {
        "field": "age"
      }
    }
  }, 
  "size": 0
}

Extended stats

比stats多4個統(tǒng)計結(jié)果：平方和桂躏、方差、標(biāo)準(zhǔn)差川陆、平均值加/減兩個標(biāo)準(zhǔn)差的區(qū)間

POST localhost:9200/nba/_search
```
{
  "query": {
    "term": {
      "class": {
        "value": "7(3)班"
      }
    }
  },
  "aggs": {
    "extendedAge": {
      "extended_stats": {
        "field": "age"
      }
    }
  }, 
  "size": 0
}
```

Percentiles

占比百分位對應(yīng)的值統(tǒng)計剂习，默認(rèn)返回[ 1, 5, 25, 50, 75, 95, 99 ]分位上的值

POST localhost:9200/nba/_search

{
  "query": {
    "term": {
      "class": {
        "value": "7(3)班"
      }
    }
  },
  "aggs": {
    "percentilesAge": {
      "percentiles": {
        "field": "age"
      }
    }
  }, 
  "size": 0
}

// 指定分位值
{
  "query": {
    "term": {
      "class": {
        "value": "7(3)班"
      }
    }
  },
  "aggs": {
    "percentilesAge": {
      "percentiles": {
        "field": "age",
        "percents": [
          20,
          50,
          75
        ]
      }
    }
  },
  "size": 0
}

桶聚合

Terms Aggregation 根據(jù)字段項分組聚合

POST localhost:9200/nba/_search

// 7(3)班按照age分組
{
  "query": {
    "term": {
      "class": {
        "value": "7(3)班"
      }
    }
  },
  "aggs": {
    "aggsAge": {
      "terms": {
        "field": "age",
        "size": 5
      }
    }
  },
  "size": 0
}

order 分組聚合排序

POST localhost:9200/nba/_search

// 7(3)班按照age分組,分組信息通過年齡從大到小排序
{
  "query": {
    "term": {
      "class": {
        "value": "7(3)班"
      }
    }
  },
  "aggs": {
    "aggsAge": {
      "terms": {
        "field": "age",
        "size": 5,
        "order": {
          "_key": "desc"
        }
      }
    }
  },
  "size": 0
}

// 7(3)班按照age分組,分組信息通過文檔數(shù)從大到小排序
{
  "query": {
    "term": {
      "class": {
        "value": "7(3)班"
      }
    }
  },
  "aggs": {
    "aggsAge": {
      "terms": {
        "field": "age",
        "size": 5,
        "order": {
          "_count": "desc"
        }
      }
    }
  },
  "size": 0
}

// 根據(jù)class分組，根據(jù)分組后的平均age倒排
{
  "aggs": {
    "aggsClass": {
      "terms": {
        "field": "class",
        "size": 10,
        "order": {
          "aggsAge": "desc"
        }
      },
      "aggs": {
        "aggsAge": {
          "avg": {
            "field": "age"
          }
        }
      }
    }
  },
  "size": 0
}

篩選分組聚合

POST localhost:9200/nba/_search

{
  "aggs": {
    "aggsClass": {
      "terms": {
        "field": "class",
        "include": ["7(3)班", "7(2)班", "7(5)班"],// 包含
        "exclude": ["7(5)班"],// 排除
        "size": 10,
        "order": {
          "aggsAge": "desc"
        }
      },
      "aggs": {
        "aggsAge": {
          "avg": {
            "field": "age"
          }
        }
      }
    }
  },
  "size": 0
}

// 正則匹配
// include较沪，exclude類型要一致
{
  "aggs": {
    "aggsClass": {
      "terms": {
        "field": "class",
        "include": "7.*",
        "exclude": "7(5)班",
        "size": 10,
        "order": {
          "aggsAge": "desc"
        }
      },
      "aggs": {
        "aggsAge": {
          "avg": {
            "field": "age"
          }
        }
      }
    }
  },
  "size": 0
}

Range Aggregation 范圍分組聚合

POST localhost:9200/nba/_search

// -13,13-14,15-  范圍分組
{
  "aggs": {
    "aggsrange": {
      "range": {
        "field": "age",
        "ranges": [
          {
            "to": 13
          },
          {
            "from": 13,
            "to": 14
          },
          {
            "from": 15
          }
        ]
      }
    }
  },
  "size": 0
}

// 范圍分組-別名
{
  "aggs": {
    "aggsrange": {
      "range": {
        "field": "age",
        "ranges": [
          {
            "to": 13,
            "key":"A"
          },
          {
            "from": 13,
            "to": 14,
            "key":"B"
          },
          {
            "from": 15,
            "key":"C"
          }
        ]
      }
    }
  },
  "size": 0
}

Date Range Aggregation 時間范圍分組聚合

POST localhost:9200/nba/_search

// Date 時間范圍分組聚合
{
  "aggs": {
    "aggsrange": {
      "date_range": {
        "field": "birthday",
        "format": "yyyy-MM",
        "ranges": [
          {
            "to": "2004-12",
            "key":"A"
          },
          {
            "from": "2005-01",
            "to": "2005-12",
            "key":"B"
          },
          {
            "from": "2006-01",
            "key":"C"
          }
        ]
      }
    }
  },
  "size": 0
}

Date Histogram Aggregation 時間柱狀圖聚合

按天鳞绕、月、年等進行聚合統(tǒng)計尸曼∶呛危可按 year (1y), quarter (1q), month (1M), week (1w), day(1d), hour (1h), minute (1m), second (1s) 間隔聚合

POST localhost:9200/nba/_search
```
{
  "aggs": {
    "aggsrange": {
      "date_histogram": {
        "field": "birthday",
        "format": "yyyy",
        "calendar_interval": "year"
      }
    }
  },
  "size": 0
}
```

query_string查詢

單個字段查詢

POST localhost:9200/nba/_search

{
  "query": {
    "query_string": {
      "default_field": "name",
      "query": "李 AND 思 OR 敏"
    }
  }
}

多個字段查詢

POST localhost:9200/nba/_search

{
  "query": {
    "query_string": {
      "fields": ["name", "sex"],
      "query": "李 AND 0"
    }
  }
}

分詞器

將?用戶輸入的一段文本，按照一定邏輯骡苞，分析成多個詞語的一種工具

內(nèi)置分詞器

standard analyzer （標(biāo)準(zhǔn)分詞器）

標(biāo)準(zhǔn)分析?是默認(rèn)分詞?垂蜗，如果未指定楷扬，則使用該分詞?
simple analyzer

simple 分析?當(dāng)它遇到只要不是字母的字符解幽，就將文本解析成term，而且所有的term都是
小寫的
whitespace analyzer

whitespace 分析?烘苹，當(dāng)它遇到空白字符時躲株，就將文本解析成terms
stop analyzer

stop 分析? 和 simple 分析?很像，唯一不同的是镣衡， stop 分析?增加了對刪除停止詞的支持霜定，默認(rèn)使?用了english停止詞

stopwords 預(yù)定義的停止詞列表，比如 (the,a,an,this,of,at)等
language analyzer

特定的語言的分詞?廊鸥，比如說望浩， english，英語分詞?),內(nèi)置語言： arabic, armenian,basque, bengali, brazilian, bulgarian, catalan, cjk, czech, danish, dutch, english, finnish,french, galician, german, greek, hindi, hungarian, indonesian, irish, italian, latvian,lithuanian, norwegian, persian, portuguese, romanian, russian, sorani, spanish,swedish, turkish, thai
pattern analyzer

用正則表達式來將文本分割成terms惰说，默認(rèn)的正則表達式是\W+（非單詞字符）

eg:

GET /_analyze
{
  "analyzer": "simple", 
  "text": "Deploy a 14-day trial of Elasticsearch Service."
}

{
  "tokens" : [
    {
      "token" : "deploy",
      "start_offset" : 0,// 開始偏移量
      "end_offset" : 6,// 結(jié)束偏移量
      "type" : "word",
      "position" : 0 // 索引
    },
    {
      "token" : "a",
      "start_offset" : 7,
      "end_offset" : 8,
      "type" : "word",
      "position" : 1
    },
    {
      "token" : "day",
      "start_offset" : 12,
      "end_offset" : 15,
      "type" : "word",
      "position" : 2
    },
    {
      "token" : "trial",
      "start_offset" : 16,
      "end_offset" : 21,
      "type" : "word",
      "position" : 3
    },
    {
      "token" : "of",
      "start_offset" : 22,
      "end_offset" : 24,
      "type" : "word",
      "position" : 4
    },
    {
      "token" : "elasticsearch",
      "start_offset" : 25,
      "end_offset" : 38,
      "type" : "word",
      "position" : 5
    },
    {
      "token" : "service",
      "start_offset" : 39,
      "end_offset" : 46,
      "type" : "word",
      "position" : 6
    }
  ]
}

中文分詞器

smartCN

一個簡單的中文或中英文混合文本的分詞?

安裝（重啟服務(wù)后使用）

sh elasticsearch-plugin install analysis-smartcn

eg:

GET /_analyze
{
  "analyzer": "smartcn", 
  "text": "有限公司"
}

{
  "tokens" : [
    {
      "token" : "有限公司",
      "start_offset" : 0,
      "end_offset" : 4,
      "type" : "word",
      "position" : 0
    }
  ]
}

IK分詞器

更智能更友好的中文分詞器

下載 https://github.com/medcl/elasticsearch-analysis-ik/releases (版本要對應(yīng))
安裝解壓到es安裝目錄-plugins目錄

eg:

GET /_analyze
{
  "analyzer": "ik_max_word", 
  "text": "有限公司"
}

{
  "tokens" : [
    {
      "token" : "有限公司",
      "start_offset" : 0,
      "end_offset" : 4,
      "type" : "CN_WORD",
      "position" : 0
    },
    {
      "token" : "有限",
      "start_offset" : 0,
      "end_offset" : 2,
      "type" : "CN_WORD",
      "position" : 1
    },
    {
      "token" : "公司",
      "start_offset" : 2,
      "end_offset" : 4,
      "type" : "CN_WORD",
      "position" : 2
    }
  ]
}

refresh

新的數(shù)據(jù)已添加到索引中??就能搜索到磨德，但是真實情況不是這樣的

先添加?個?檔，再?刻搜索吆视，獲取不到新添加的數(shù)據(jù)

curl -X PUT localhost:9200/stu/_doc/666 -H 'Content-Type:application/json' -d '{ "name": "王絲菲" }'
curl -X GET localhost:9200/stu/_doc/_search?pretty

強制刷新

curl -X PUT localhost:9200/stu/_doc/667?refresh -H 'Content-Type:application/json' -d '{ "name": "王豆豆" }'
curl -X GET localhost:9200/stu/_doc/_search?pretty

修改默認(rèn)更新時間(默認(rèn)時間是1s)

PUT localhost:9200/stu/_settings
```
{
  "index": {
    "refresh_interval": "5s"
  }
}
```
將refresh關(guān)閉

PUT localhost:9200/stu/_settings
```
{
  "index": {
    "refresh_interval": "-1"
  }
}
```

高亮查詢

POST localhost:9200/stu/_search

// 參數(shù)
{
  "query": {
    "match": {
      "name": "趙"
    }
  },
  "highlight": {
    "fields": {
      "name": {}
    }
  }
}

// 相應(yīng)
{
  "took" : 4,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 2.4191523,
    "hits" : [
      {
        "_index" : "stu",
        "_type" : "_doc",
        "_id" : "10",
        "_score" : 2.4191523,
        "_source" : {
          "name" : "趙曦",
          "age" : 14,
          "sex" : "0",
          "class" : "7(2)班",
          "birthday" : "2005-09-02"
        },
        "highlight" : {
          "name" : [
            "<em>趙</em>曦"
          ]
        }
      }
    ]
  }
}

自定義高亮查詢

POST localhost:9200/stu/_search

// 參數(shù)
{
  "query": {
    "match": {
      "name": "趙"
    }
  },
  "highlight": {
    "fields": {
      "name": {
        "pre_tags": ["<p>"],
        "post_tags": ["</p>"]
      }
    }
  }
}

// 響應(yīng)
{
  "took" : 6,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 1,
      "relation" : "eq"
    },
    "max_score" : 2.4191523,
    "hits" : [
      {
        "_index" : "stu",
        "_type" : "_doc",
        "_id" : "10",
        "_score" : 2.4191523,
        "_source" : {
          "name" : "趙曦",
          "age" : 14,
          "sex" : "0",
          "class" : "7(2)班",
          "birthday" : "2005-09-02"
        },
        "highlight" : {
          "name" : [
            "<p>趙</p>曦"
          ]
        }
      }
    ]
  }
}

查詢建議

查詢建議典挑，是為了給?戶提供更好的搜索體驗。包括：詞條檢查啦吧，?動補全

字段類型

類型	描述
text	指定搜索文本
field	獲取建議器的搜索字段
analyzer	指定分詞器
size	每個詞返回的最大建議詞數(shù)
sort	如何對建議詞進行排序您觉，可用選項：score-先按評分排序，再按文檔頻率排序授滓，term順序琳水；frequency：先按文檔頻率排序肆糕，再按評分排序，term順序炫刷；
suggest_mode	建議模式擎宝，控制提供建議詞的方式：missing-僅在搜索的詞項在索引中不存在時才提供建議詞，默認(rèn)值浑玛；popular-僅建議文檔頻率比搜索詞項高的詞绍申；always-總是提供匹配的建議詞；

suggester

Term suggester

term 詞條建議器顾彰，對給輸?的文本進?分詞极阅，為每個分詞提供詞項建議

POST localhost:9200/stu/_search

// 參數(shù)
{
  "suggest": {
    "MY_SUGGESTION": {
      "text": "7(6)班",
      "term": {
        "suggest_mode": "missing",
        "field": "class"
      }
    }
  }
}

{
  "took" : 105,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 0,
      "relation" : "eq"
    },
    "max_score" : null,
    "hits" : [ ]
  },
  "suggest" : {
    "MY_SUGGESTION" : [
      {
        "text" : "7(6)班",
        "offset" : 0,
        "length" : 5,
        "options" : [
          {
            "text" : "7(2)班",
            "score" : 0.8,
            "freq" : 4
          },
          {
            "text" : "7(3)班",
            "score" : 0.8,
            "freq" : 3
          },
          {
            "text" : "7(5)班",
            "score" : 0.8,
            "freq" : 3
          }
        ]
      }
    ]
  }
}

Phrase suggester

phrase 短語建議，在term的基礎(chǔ)上涨享，會考量多個term之間的關(guān)系筋搏，?如是否同時出現(xiàn)在索

引的原文里，相鄰程度厕隧，以及詞頻等

POST localhost:9200/stu/_search

// 參數(shù)
{
  "suggest": {
    "MY_SUGGESTION": {
      "text": "7(2) 班",
      "phrase": {
        "field": "class"
      }
    }
  }
}

// 響應(yīng)
{
  "took" : 17,
  "timed_out" : false,
  "_shards" : {
    "total" : 1,
    "successful" : 1,
    "skipped" : 0,
    "failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 0,
      "relation" : "eq"
    },
    "max_score" : null,
    "hits" : [ ]
  },
  "suggest" : {
    "MY_SUGGESTION" : [
      {
        "text" : "7(2) 班",
        "offset" : 0,
        "length" : 6,
        "options" : [
          {
            "text" : "7(2)班",
            "score" : 0.4678218
          },
          {
            "text" : "7(3)班",
            "score" : 0.37474233
          },
          {
            "text" : "7(5)班",
            "score" : 0.37474233
          }
        ]
      }
    ]
  }
}

Completion suggester

完成建議奔脐，自動補充查詢內(nèi)容后面的內(nèi)容

POST localhost:9200/stu/_search

// 要查詢字段的類型必須是 completion
{
  "suggest": {
    "MY_SUGGESTION": { // 自定義名稱
      "text": "I like",
      "completion": {
        "field": "selfDesc"
      }
    }
  }
}

最后編輯于：2020.04.06 21:01:31

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ElasticSearch 7.x

Elasticsearch 7.x

簡介

官網(wǎng)地址

核心概念

字段類型

核心數(shù)據(jù)類型

復(fù)雜數(shù)據(jù)類型

專?用數(shù)據(jù)類型

索引

索引別名

映射

文檔

查詢搜索

term(詞條)查詢

full text(全文)查詢

范圍查詢

布爾查詢

排序查詢

聚合查詢

指標(biāo)聚合

桶聚合

query_string查詢

分詞器

內(nèi)置分詞器

中文分詞器

refresh

高亮查詢

查詢建議

字段類型

suggester

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