Elasticsearch中文文档,内容不全

注意

内容不全,这是观看中文文档进行操作的

文档地址

旧版中文文档,部分内容过期 https://www.elastic.co/guide/cn/elasticsearch/guide/current/index.html

1.0.0 `基础入门`

1.1.0 `你知道的,为了搜索...`

1.1.1 `索引员工文档`

megacorp 索引名称 -> 数据库
employee 类型名称 -> 表
1 特定雇员的ID -> 主键
请求体 JSON文档 -> 行

PUT /megacorp/employee/1
{
    "first_name" : "John",
    "last_name" :  "Smith",
    "age" :        25,
    "about" :      "I love to go rock climbing",
    "interests": [ "sports", "music" ]
}
PUT /megacorp/employee/2
{
    "first_name" :  "Jane",
    "last_name" :   "Smith",
    "age" :         32,
    "about" :       "I like to collect rock albums",
    "interests":  [ "music" ]
}
PUT /megacorp/employee/3
{
    "first_name" :  "Douglas",
    "last_name" :   "Fir",
    "age" :         35,
    "about":        "I like to build cabinets",
    "interests":  [ "forestry" ]
}

执行聚合"aggs"需要设置"fielddata":true

PUT megacorp/employee/_mapping
{
  "properties": {
    "interests":{
      "type": "text", 
      "fielddata": true
    }
  }
}

1.1.2 `检索文档`

根据索引类型 id查询指定文档

GET /megacorp/employee/1

结果

{
  "_index": "megacorp",
  "_type": "employee",
  "_id": "1",
  "_version": 4,
  "found": true,
  "_source": {//原始JSON文档
    "first_name": "John",
    "last_name": "Smith",
    "age": 25,
    "about": "I love to go rock climbing",
    "interests": [
      "sports",
      "music"
    ]
  }
}

1.1.3 `轻量搜索`

根据索引类型查询全部文档

GET /megacorp/employee/_search

结果

{
  "took": 1,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 3,//匹配到3条
    "max_score": 1,
    "hits": [//显示匹配的记录
      {
        "_index": "megacorp",
        "_type": "employee",
        "_id": "2",
        "_score": 1,
        "_source": {
          "first_name": "Jane",
          "last_name": "Smith",
          "age": 32,
          "about": "I like to collect rock albums",
          "interests": [
            "music"
          ]
        }
      },
      {
        "_index": "megacorp",
        "_type": "employee",
        "_id": "1",
        "_score": 1,
        "_source": {
          "first_name": "John",
          "last_name": "Smith",
          "age": 25,
          "about": "I love to go rock climbing",
          "interests": [
            "sports",
            "music"
          ]
        }
      },
      {
        "_index": "megacorp",
        "_type": "employee",
        "_id": "3",
        "_score": 1,
        "_source": {
          "first_name": "Douglas",
          "last_name": "Fir",
          "age": 35,
          "about": "I like to build cabinets",
          "interests": [
            "forestry"
          ]
        }
      }
    ]
  }
}

1.1.4 `使用查询表达式搜索`

查询 last_name=smith

GET /megacorp/employee/_search
{
    "query" : {
        "match" : {"last_name" : "Smith"}
    }
}

结果

...
  "hits": {
    "total": 2,
    "max_score": 0.2876821,
    "hits": [
      {
        "_index": "megacorp",
        "_type": "employee",
        "_id": "2",
        "_score": 0.2876821,
        "_source": {
          "first_name": "Jane",
          "last_name": "Smith",
          "age": 32,
          "about": "I like to collect rock albums",
          "interests": [
            "music"
          ]
        }
      },
      {
        "_index": "megacorp",
        "_type": "employee",
        "_id": "1",
        "_score": 0.2876821,
        "_source": {
          "first_name": "John",
          "last_name": "Smith",
          "age": 25,
          "about": "I love to go rock climbing",
          "interests": [
            "sports",
            "music"
          ]
        }
      }
    ]
  }
...

1.1.5 `更复杂的搜索`

查询 last_name=smith and age>30

GET /megacorp/employee/_search
{
    "query" : {
        "bool": {
            "must": {
                "match" : {
                    "last_name" : "smith" 
                }
            },
            "filter": {
                "range" : {
                    "age" : { "gt" : 30 } 
                }
            }
        }
    }
}

结果

...
  "hits": {
    "total": 1,
    "max_score": 0.2876821,
    "hits": [
      {
        "_index": "megacorp",
        "_type": "employee",
        "_id": "2",
        "_score": 0.2876821,
        "_source": {
          "first_name": "Jane",
          "last_name": "Smith",
          "age": 32,
          "about": "I like to collect rock albums",
          "interests": [
            "music"
          ]
        }
      }
    ]
  }
...

1.1.6 `全文检索`

查询about中含有词rock climbing
根据匹配得分_score进行排序

GET /megacorp/employee/_search
{
    "query" : {
        "match" : {"about" : "rock climbing"}
    }
}

结果

...
  "hits": {
    "total": 2,//匹配2条
    "max_score": 0.5753642,//最大得分
    "hits": [
      {
        "_index": "megacorp",
        "_type": "employee",
        "_id": "1",
        "_score": 0.5753642,
        "_source": {
          "first_name": "John",
          "last_name": "Smith",
          "age": 25,
          "about": "I love to go rock climbing",
          "interests": [
            "sports",
            "music"
          ]
        }
      },
      {
        "_index": "megacorp",
        "_type": "employee",
        "_id": "2",
        "_score": 0.2876821,//得分低 因为"about"只包含了"rock"
        "_source": {
          "first_name": "Jane",
          "last_name": "Smith",
          "age": 32,
          "about": "I like to collect rock albums",
          "interests": [
            "music"
          ]
        }
      }
    ]
  }
...

1.1.7 `短语搜索`

仅匹配"about"中含有"rock climbing"短语
根据匹配得分"_score"进行排序

GET /megacorp/employee/_search
{
    "query" : {
        "match_phrase" : {"about" : "rock climbing"}
    }
}

结果

...
  "hits": {
    "total": 1,
    "max_score": 0.5753642,
    "hits": [
      {
        "_index": "megacorp",
        "_type": "employee",
        "_id": "1",
        "_score": 0.5753642,
        "_source": {
          "first_name": "John",
          "last_name": "Smith",
          "age": 25,
          "about": "I love to go rock climbing",
          "interests": [
            "sports",
            "music"
          ]
        }
      }
    ]
  }
...

1.1.8 `高亮搜索`

根据匹配得分"_score"进行排序
在"highlight"中使用"em"标签封装了"about"中匹配到的词

GET /megacorp/employee/_search
{
    "query" : {
        "match_phrase" : {"about" : "rock climbing"}
    },
    "highlight": {
        "fields" : {"about" : {}}
    }
}

结果

...
  "hits": {
    "total": 1,
    "max_score": 0.5753642,
    "hits": [
      {
        "_index": "megacorp",
        "_type": "employee",
        "_id": "1",
        "_score": 0.5753642,
        "_source": {
          "first_name": "John",
          "last_name": "Smith",
          "age": 25,
          "about": "I love to go rock climbing",
          "interests": [
            "sports",
            "music"
          ]
        },
        "highlight": {//匹配到的使用了"em"标签封装
          "about": [
            "I love to go <em>rock</em> <em>climbing</em>"
          ]
        }
      }
    ]
  }
...

1.1.9 `分析`

按照"interests"进行分组

GET /megacorp/employee/_search
{
  "aggs": {
    "all_interests": {//聚合桶名称
      "terms": { "field": "interests" }
    }
  }
}

结果

...
  "aggregations": {
    "all_interests": {
      "doc_count_error_upper_bound": 0,
      "sum_other_doc_count": 0,
      "buckets": [
        {
          "key": "music",
          "doc_count": 2
        },
        {
          "key": "forestry",
          "doc_count": 1
        },
        {
          "key": "sports",
          "doc_count": 1
        }
      ]
    }
  }
...

查询 last_name=smith 并按照"interests"中的内容进行分组

GET /megacorp/employee/_search
{
  "query": {
    "match": { "last_name": "smith"}
  },
  "aggs": {
    "all_interests": {
      "terms": {"field": "interests" }
    }
  }
}

结果

...
  "aggregations": {
    "all_interests": {
      "doc_count_error_upper_bound": 0,
      "sum_other_doc_count": 0,
      "buckets": [
        {
          "key": "music",
          "doc_count": 2
        },
        {
          "key": "sports",
          "doc_count": 1
        }
      ]
    }
  }
...

先聚合桶再进行度量

GET /megacorp/employee/_search
{
    "aggs" : {
        "all_interests" : {
            "terms" : { "field" : "interests" },
            "aggs" : {
                "avg_age" : {"avg" : { "field" : "age" }}
            }
        }
    }
}

结果

...
  "aggregations": {
    "all_interests": {//聚合桶名称
      "doc_count_error_upper_bound": 0,
      "sum_other_doc_count": 0,
      "buckets": [
        {
          "key": "music",
          "doc_count": 2,
          "avg_age": {
            "value": 28.5
          }
        },
        {
          "key": "forestry",
          "doc_count": 1,
          "avg_age": {
            "value": 35
          }
        },
        {
          "key": "sports",
          "doc_count": 1,
          "avg_age": {
            "value": 25
          }
        }
      ]
    }
  }
...

1.2.0 `集群内的原理`

1.2.1 `集群健康`

GET /_cluster/health

结果
①

green 所有的主分片和副本分片都正常运行。
yellow 所有的主分片都正常运行，但不是所有的副本分片都正常运行。
red 有主分片没能正常运行。

{
  "cluster_name": "docker-cluster",
  "status": "yellow",//①
  "timed_out": false,
  "number_of_nodes": 1,
  "number_of_data_nodes": 1,
  "active_primary_shards": 23,
  "active_shards": 23,
  "relocating_shards": 0,
  "initializing_shards": 0,
  "unassigned_shards": 20,
  "delayed_unassigned_shards": 0,
  "number_of_pending_tasks": 0,
  "number_of_in_flight_fetch": 0,
  "task_max_waiting_in_queue_millis": 0,
  "active_shards_percent_as_number": 53.48837209302325
}

1.2.2 `添加索引`

PUT /blogs
{
   "settings" : {
      "number_of_shards" : 3,//分片
      "number_of_replicas" : 1//副本
   }
}

1.3.0 `数据输入和输出`

1.3.1 `文档元数据`

_index 放在哪个数据库 这个名字必须小写,不能以下划线开头,不能包含逗号
_type 放在哪个表 可以是大写或者小写,但是不能以下划线或者句号开头,不应该包含逗号,并且长度限制为256个字符
_id 文档唯一标识 字符串类型,不指定会自动生成

1.3.2 `索引文档`

指定id创建文档

PUT /website/blog/123
{
  "title": "My first blog entry",
  "text":  "Just trying this out...",
  "date":  "2014/01/01"
}

不指定id创建文档

PUT /website/blog
{
  "title": "My first blog entry",
  "text":  "Just trying this out...",
  "date":  "2014/01/01"
}

1.3.3 `取回一个文档`

GET website/blog/123

结果

{
  "_index": "website",
  "_type": "blog",
  "_id": "123",
  "_version": 1,
  "found": true,
  "_source": {
    "title": "My first blog entry",
    "text": "Just trying this out...",
    "date": "2014/01/01"
  }
}

只返回原始文档_source

GET website/blog/123/_source

结果

{
  "title": "My first blog entry",
  "text": "Just trying this out...",
  "date": "2014/01/01"
}

1.3.4 `检查文档是否存在`

使用HEAD代替GET,只返回请求头,没有请求体

HEAD /website/blog/123

返回 200 - OK

HEAD /website/blog/124

返回 404 - Not Found

1.3.5 `更新整个文档`

删除旧文档,创建一个新文档,如果不存在就创建一个新文档

PUT /website/blog/123
{
  "title": "My first blog entry",
  "text":  "I am starting to get the hang of this...",
  "date":  "2014/01/02"
}

1.3.6 `创建新文档`

加参数存在不能创建

POST /website/blog/123?op_type=create
{
 "name":"taopanfeng" 
}

等同于下面

POST /website/blog/123/_create
{
 "name":"taopanfeng1" 
}

都是返回结果

{
  "error": {
    "root_cause": [
      {
        "type": "version_conflict_engine_exception",
        "reason": "[blog][123]: version conflict, document already exists (current version [5])",
        "index_uuid": "reL04BFdQN-YCE3l9THqjA",
        "shard": "0",
        "index": "website"
      }
    ],
    "type": "version_conflict_engine_exception",
    "reason": "[blog][123]: version conflict, document already exists (current version [5])",
    "index_uuid": "reL04BFdQN-YCE3l9THqjA",
    "shard": "0",
    "index": "website"
  },
  "status": 409
}

不加参数

POST /website/blog/111
{
 "name":"taopanfeng" 
}

不存在创建result是created,_version是1

{
  "_index": "website",
  "_type": "blog",
  "_id": "111",
  "_version": 1,
  "result": "created",
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  },
  "_seq_no": 1,
  "_primary_term": 1
}

存在更新result是updated,_version加1

{
  "_index": "website",
  "_type": "blog",
  "_id": "111",
  "_version": 2,
  "result": "updated",
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  },
  "_seq_no": 2,
  "_primary_term": 1
}

1.3.7 `删除文档`

DELETE /website/blog/123

已存在结果 result为deleted

{
  "_index": "website",
  "_type": "blog",
  "_id": "123",
  "_version": 6,
  "result": "deleted",//删除成功
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  },
  "_seq_no": 5,
  "_primary_term": 1
}

不存在结果 result为not_found

{
  "_index": "website",
  "_type": "blog",
  "_id": "123",
  "_version": 1,
  "result": "not_found",//未找到
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  },
  "_seq_no": 6,
  "_primary_term": 1
}

1.3.8 `处理冲突`

两个人在购买同一种物品,原库存100,A读取到,B也读取到,B买了一件这个商品,
此时商品库存为99,但是B读取到的是100,B买了一件之后还是99,就形成了冲突

悲观锁 我修改之后,别人才可以修改
乐观锁 假设不可以冲突,如果读取的时候被修改,就更新失败
elasticsearch就是使用乐观锁

1.3.9 `乐观并发控制`

创建一篇文章

PUT /website/blog/888/_create
{
 "name":"taopanfeng888" 
}

获取数据

GET /website/blog/888

结果,其中_version就是版本号

{
  "_index": "website",
  "_type": "blog",
  "_id": "888",
  "_version": 1,
  "found": true,
  "_source": {
    "name": "taopanfeng888"
  }
}

现在修改文档,指定版本号为当前版本号1

PUT /website/blog/888?version=1
{
 "name":"taopanfeng888-update"
}

结果修改成功 _version版本号+1 result为updated

{
  "_index": "website",
  "_type": "blog",
  "_id": "888",
  "_version": 2,
  "result": "updated",
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  },
  "_seq_no": 1,
  "_primary_term": 1
}

如果仍然执行上面 version=1
结果修改失败因为需要指定version等于当前版本号才可以修改

{
  "error": {
    "root_cause": [
      {
        "type": "version_conflict_engine_exception",
        "reason": "[blog][888]: version conflict, current version [2] is different than the one provided [1]",
        "index_uuid": "reL04BFdQN-YCE3l9THqjA",
        "shard": "2",
        "index": "website"
      }
    ],
    "type": "version_conflict_engine_exception",
    "reason": "[blog][888]: version conflict, current version [2] is different than the one provided [1]",
    "index_uuid": "reL04BFdQN-YCE3l9THqjA",
    "shard": "2",
    "index": "website"
  },
  "status": 409
}

但是我们可以使用 version_type指定external来设置
但是指定的version要大于当前版本号,小于等于都不可以

PUT /website/blog/888?version=99&version_type=external
{
 "name":"taopanfeng888-v99" 
}

结果修改成功版本号也改为了99

{
  "_index": "website",
  "_type": "blog",
  "_id": "888",
  "_version": 99,
  "result": "updated",
  "_shards": {
    "total": 2,
    "successful": 1,
    "failed": 0
  },
  "_seq_no": 2,
  "_primary_term": 1
}

1.3.10 `文档的部分更新`

先添加一篇文章

PUT /website/blog/3/_create
{
  "name":"taopanfeng"
}

使用POST请求加上参数_update来对doc添加指定更新
如果doc中指定属性不存在则添加
如果存在 age=26 又改为 age=27 则会更新成功
如果存在 age=27 又改为 age=27 则会不进行更新返回result为noop
如果为多个字段例如 age=27 and sex=man 更新其中任何一个就可以更新成功

POST /website/blog/3/_update
{
  "doc": {
    "age":26
  }
}

结果更新成功版本号+1 result为updated

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

检索 GET /website/blog/3

{
  "_index": "website",
  "_type": "blog",
  "_id": "3",
  "_version": 2,
  "found": true,
  "_source": {
    "name": "taopanfeng",
    "age": 26
  }
}

1.3.11 `取回多个文档`

查询website/blog/2 website/blog/1并只显示name字段 website/pageviews/1

GET /_mget
{
   "docs" : [
      {
         "_index" : "website",
         "_type" :  "blog",
         "_id" :    2
      },
      {
         "_index" : "website",
         "_type" :  "blog",
         "_id" :    1,
         "_source": "name"//只显示"name"属性
      },
      {
         "_index" : "website",
         "_type" :  "pageviews",//查询类型为"pageviews"
         "_id" :    1
      }
   ]
}

结果

{
  "docs": [
    {
      "_index": "website",
      "_type": "blog",
      "_id": "2",
      "_version": 2,
      "found": true,
      "_source": {
        "name": "taopanfeng",
        "age": 26
      }
    },
    {
      "_index": "website",
      "_type": "blog",
      "_id": "1",
      "_version": 2,
      "found": true,
      "_source": {
        "name": "taopanfeng"//指定了"_source": "name"
      }
    },
    {
      "_index": "website",
      "_type": "pageviews",
      "_id": "1",
      "found": false//未找到
    }
  ]
}

查询 id为2 1 55

GET /website/blog/_mget
{
   "ids" : [ "2", "1" ,"55"]
}

结果

{
  "docs": [
    {
      "_index": "website",
      "_type": "blog",
      "_id": "2",
      "_version": 2,
      "found": true,
      "_source": {
        "name": "taopanfeng",
        "age": 26
      }
    },
    {
      "_index": "website",
      "_type": "blog",
      "_id": "1",
      "_version": 2,
      "found": true,
      "_source": {
        "name": "taopanfeng",
        "age": 26
      }
    },
    {
      "_index": "website",
      "_type": "blog",
      "_id": "55",
      "found": false
    }
  ]
}

1.3.12 `代价较小的批量操作`

每个操作都是独立的,互不影响

bulk允许多次 create,index,update,delete
create 成功201 失败409
index 成功201
update 成功200 失败404 _id不存在
delete 成功200 失败404 _id不存在

POST _bulk
{ "create":  { "_index": "website", "_type": "blog", "_id": "1" }}
{ "title":    "My first blog post" }
{ "create":  { "_index": "website", "_type": "blog", "_id": "2" }}
{ "title":    "My first blog post" }
{ "index":  { "_index": "website", "_type": "blog"}}
{ "title":    "My first blog post" }
{ "delete": { "_index": "website", "_type": "blog", "_id": "1" }}
{ "update":{ "_index": "website", "_type": "blog", "_id": "2" }}
{"doc":{"content":"I'm content...."}}

改进都是操作同一个索引类型

POST /website/blog/_bulk
{ "create":  {"_id": "1" }}
{ "title":    "My first blog post" }
{ "create":  {"_id": "2" }}
{ "title":    "My first blog post" }
{ "index":  {}}
{ "title":    "My first blog post" }
{ "delete": {"_id": "1" }}
{ "update":{"_id": "2" }}
{"doc":{"content":"I'm content...."}}

1.4.0 `搜索——最基本的工具`

1.4.1 `多索引,多类型`

//查找所有索引的所有文档
GET _search

//查找cars索引的所有文档
GET cars/_search

//*代表[0,多]
GET website,cars/_search
GET *sit*,*ar*/_search

//it开头的索引的所有文档
GET it*/_search

//查询"site"结尾,"it"开头,含有"ar"的所有索引的所有文档
GET *site,it*,*ar*/_search

//查询"item"和"website"索引的"blog"类型的文档
GET item,website/blog/_search

//查找所有索引的"blog" "user"类型文档
GET _all/blog,user/_search

1.4.2 `分页`

size默认10 代表"hits"数组显示的数量,最小为0,大于等于"total"都会显示全部
from默认0 代表要跳过几条
例如 一共五条 size=2 from=1 则只会显示第2 3两条数据

GET _search
{
 "size":10,
 "from":0
}

//等同于

GET _search?size=10&from=0

1.5.0 `映射和分析`

1.5.1 `映射`

获取映射

GET cars/transactions/_mapping

结果

{
  "cars": {
    "mappings": {
      "transactions": {
        "properties": {
          "color": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              }
            }
          },
          "make": {
            "type": "text",
            "fields": {
              "keyword": {
                "type": "keyword",
                "ignore_above": 256
              }
            }
          },
          "price": {
            "type": "long"
          },
          "sold": {
            "type": "date"
          }
        }
      }
    }
  }
}

字符串类型
- text 可分词,不可聚合
- keyword 可聚合,不可分词
基本数值类型
- long、interger、short、byte、double、float、half_float
日期类型
- date 建议存为 long类型

创建映射字段
设置"index": "false"不能对该字段进行搜索
text类型默认会进行分词,也可以指定分词器"analyzer": "分词器"
text想设置聚合需要设置 "fielddata": true

PUT 索引/类型/_mapping/
{
  "properties": {
    "字段名称": {
      "type": "text",
      "analyzer": "ik_max_word"
    },
    "字段名称": {
      "type": "keyword",
      "index": "false"
    },
    "字段名称": {
      "type": "float"
    }
  }
}

查看映射关系

GET 索引/类型/_mapping

删除索引

DELETE 索引

1.6.0 `请求体查询`

1.6.1 `查询表达式`

查询全部索引的全部类型
请求体为空可以省略
全部索引 _all 可以省略

GET _search

GET _search
{}

GET _search
{
  "query": {
    "match_all": {}
  }
}

GET _all/_search
{}

指定索引类型查询
*可以表示零个或多个,cars可以匹配ca* *ar* *s

查询多个索引的全部类型的全部文档

GET 索引1,索引2/_search

查询多个索引的多个类型的全部文档

GET 索引1,索引2/类型1,类型2/_search

查询 price=15000

GET cars/transactions/_search
{
  "query": {
    "match": {
      "price": 15000
    }
  }
}

1.6.2 `最重要的查询`

match_all默认的查询,匹配所有文档

GET a1/student/_search
{
  "query": {
	"match_all": {}
  }
}

结果

{
  "took": 4,//查询耗时4毫秒
  "timed_out": false,//没有超时
  "_shards": {//分片
	"total": 5,//一共5个
	"successful": 5,//成功5个
	"skipped": 0,//跳过0个
	"failed": 0//失败0个
  },
  "hits": {//查询到的数据
	"total": 3,//查询总条数
	"max_score": 1,//最大得分1
	"hits": [//查询到的数据所有文档
	  {//一个文档
		"_index": "a1",//数据库
		"_type": "student",//表
		"_id": "2",//注解 每个文档的唯一标识
		"_score": 1,//得分是1 满分是最大得分
		"_source": {//查询到的数据 包括 字段 字段值 -> k:v
		  "name": "大米手机",
		  "age": 22
		}
	  },
	  {
		"_index": "a1",
		"_type": "student",
		"_id": "CA2Yqm0Bmr19jrNQ7nRL",
		"_score": 1,
		"_source": {
		  "name": "小米手机",
		  "age": 11
		}
	  },
	  {
		"_index": "a1",
		"_type": "student",
		"_id": "3",
		"_score": 1,
		"_source": {
		  "name": "小米电视4K",
		  "age": 33,
		  "address": "安徽阜阳小米酒店101"
		}
	  }
	]
  }
}

match查询
text类型会分词查询字符串
数组,日期,布尔或not_analyzed字符串字段,就会精准匹配

{ "match": { "tweet": "About Search" }}

{ "match": { "age":    26           }}

{ "match": { "date":   "2014-09-01" }}

{ "match": { "public": true         }}

{ "match": { "tag":    "full_text"  }}

//测试笔记
match
查询 name=小米电视
因为使用了分词,默认是or 所以可匹配 -> 小米 or 电视
GET a1/_search
{
  "query": {
    "match": {
      "name": "小米电视"
    }
  }
}

查询分词,指定and可匹配 -> 小米 and 电视
GET a1/_search
{
  "query": {
    "match": {
      "name": {
        "query": "小米电视",
        "operator": "and"
      }
    }
  }
}

可以指定分词的个数,
1 -> 匹配任意一个词
2 -> 匹配任意两个词
3 -> 因为超过了分词量,所以匹配不到
GET a1/_search
{
  "query": {
    "match": {
      "name": {
        "query": "小米电视",
        "minimum_should_match": 1
      }
    }
  }
}

3x0.66=1.98,因为1.98<2 所以匹配任意一个
GET a1/_search
{
  "query": {
    "match": {
      "name": {
        "query": "小米智能电视",
        "minimum_should_match": "66%"
      }
    }
  }
}

3x0.67=2.01,因为2.01>2 所以匹配任意两个
GET a1/_search
{
  "query": {
    "match": {
      "name": {
        "query": "小米智能电视",
        "minimum_should_match": "67%"
      }
    }
  }
}

multi_match多字段搜索 name like '%大米%' or f1 like '%大米%'

GET a1/student/_search
{
  "query": {
    "multi_match": {
      "query": "大米",
      "fields": ["name","f1"]
    }
  }
}

range查询 10<=age<=20
lt <
lte <=
gt >
gte >=

GET a1/student/_search
{
  "query": {
    "range": {
      "age": {
        "gte": 10,
        "lte": 20
      }
    }
  }
}

term精准匹配

GET a1/student/_search
{
  "query": {
    "term": {
      "age": {
        "value": 11
      }
    }
  }
}

terms多值匹配,满足一个即可

GET a1/student/_search
{
  "query": {
    "terms": {
      "age": [11,22,77]
    }
  }
}

exists查询存在指定字段的文档

GET a1/student/_search
{
  "query": {
    "exists":{
      "field":"address"
    }
  }
}

1.6.3 `组合多查询`

与 must[{1},{2}] 满足所有
查询"name"分词有"小米"并且"age"等于11或者22

GET a1/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "name": "小米"
          }
        },
        {
          "terms": {
            "age": [11,22]
          }
        }
      ]
    }
  }
}

非 must_not[{1},{2}] 不满足所有
查询"name"分词没有"小米并且"age"不等于11或者22

GET a1/_search
{
  "query": {
    "bool": {
      "must_not": [
        {
          "match": {
            "name": "小米"
          }
        },
        {
          "terms": {
            "age": [11,22]
          }
        }
      ]
    }
  }
}

或 should[{1},{2}] 满足任意一个

GET a1/_search
{
  "query": {
    "bool": {
      "should": [
        {
          "match": {
            "name": "小米"
          }
        },
        {
          "terms": {
            "age": [11,22]
          }
        }
      ]
    }
  }
}

结果过滤

查询字段只显示 name age
并且查询 age in [11,22,77]
GET a1/_search
{
  "_source": ["name","age"],
  "query": {
    "terms": {
      "age": [11,22,77]
    }
  }
}

查询所有 只显示"address"字段,没有此字段的显示空
GET a1/_search
{
  "_source": {
    "includes": ["address"]
  }
}

查询所有只除了"address"字段,其他全显示
GET a1/_search
{
  "_source": {
    "excludes": ["address"]
  }
}

过滤 filter会将评分设置为0,不会使评分对结果影响
查询"name"=小米并且10<=age<=20

GET a1/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "match": {
            "name": "小米"
          }
        }
      ],
      "filter": {
        "range": {
          "age": {
            "gte": 10,
            "lte": 20
          }
        }
      }
    }
  }
}

1.7.0 `排序与相关性`

1.7.1 `排序`

排序
查询"name"=小米并按照年龄降序

GET a1/_search
{
  "query": {
    "match": {
      "name": "小米"
    }
  },
  "sort": [
    {
      "age": {
        "order": "desc"
      }
    }
  ]
}

多字段排序先排序第一个,第一个相同才会对第二个进行排序

GET a1/_search
{
  "query": {
    "match": {
      "name": "小米"
    }
  },
  "sort": [
    {"age": {"order": "desc"}},
	{"_score": {"order": "asc"}}
  ]
}

1.7.2 `什么是相关性?`

检索词频率 一个词出现次数多相关性越高
反向文档频率 一个词只在一个文档中存在,相关性高,如果在十个文档中存在,相关性低
字段长度准则 "a"在"ab"中相关性比在"abcd"中要高,长度越短越高

1.8.0 `索引管理`

1.8.1 `创建一个索引`

手动创建索引

PUT 索引名
{
	"settings":{...},
	"mappings":{
		"类型名称1":{...},
		"类型名称2":{...}
	}
}

设置禁止自动创建索引
找到 config/elasticsearch.yml
在每个节点下添加 action.auto_create_index: false

1.8.2 `删除一个索引`

删除指定索引

DELETE /my_index

删除多个索引

DELETE /index_one,index_two
DELETE /index_*

+删除全部索引

DELETE /_all
DELETE /*

如果不想使用 _all 或 * 来批量删除索引
设置elasticsearch.yml配置action.destructive_requires_name: true

1.8.3 `索引设置`

number_of_shards 分片默认5
number_of_replicas 副本默认1

PUT /my_temp_index
{
    "settings": {
        "number_of_shards" :   1,
        "number_of_replicas" : 0
    }
}

可以修改副本,不能修改分片

PUT /my_temp_index/_settings
{
    "number_of_replicas": 1
}

1.8.4 `索引别名`

创建一个索引g

PUT g

查看g

GET g

结果此时aliases为空

{
  "g": {
    "aliases": {},
    "mappings": {},
    "settings": {
      "index": {
        "creation_date": "1570706049853",
        "number_of_shards": "5",
        "number_of_replicas": "1",
        "uuid": "N0uDV7bmSRGBYG3Vnk51Og",
        "version": {
          "created": "6050099"
        },
        "provided_name": "g"
      }
    }
  }
}

创建一个别名g1

PUT g/_alias/g1

此时执行GET g 或 GET g1是一样的效果,返回

{
  "g": {
    "aliases": {
      "g1": {}
    },
...

批量操作
指定g删除别名g1
指定g添加别名g2
指定g添加别名g3

POST _aliases
{
  "actions": [
    {"remove": {"index": "g","alias": "g1"}},
    {"add": {"index": "g","alias": "g2"}},
    {"add": {"index": "g","alias": "g3"}}

  ]
}

结果

{
  "g": {
    "aliases": {
      "g2": {},
      "g3": {}
    },
...

2.0.0 `深入搜索`

2.1.0 `结构化搜索`

2.1.1 `精确值查找`

先设置类型,设置productID不分词,可以精确查找

PUT my_store/products/_mapping
{
  "properties": {
    "productID":{
      "type": "keyword"
    }
  }
}

添加数据

POST /my_store/products/_bulk
{ "index": { "_id": 1 }}
{ "price" : 10, "productID" : "XHDK-A-1293-#fJ3" }
{ "index": { "_id": 2 }}
{ "price" : 20, "productID" : "KDKE-B-9947-#kL5" }
{ "index": { "_id": 3 }}
{ "price" : 30, "productID" : "JODL-X-1937-#pV7" }
{ "index": { "_id": 4 }}
{ "price" : 30, "productID" : "QQPX-R-3956-#aD8" }

精确查找 price=20

GET my_store/products/_search
{
  "query": {
    "term" : {
      "price" : 20
    }
  }
}

不希望评估计算,进行排除,包括的计算
这样做可以优化速度,统计评分设置 1

GET /my_store/products/_search
{
    "query" : {
        "constant_score" : { 
            "filter" : {
                "term" : { 
                    "price" : 20
                }
            }
        }
    }
}

查询 productID=XHDK-A-1293-#fJ3

GET /my_store/products/_search
{
    "query" : {
        "constant_score" : {
            "filter" : {
                "term" : {
                    "productID" : "XHDK-A-1293-#fJ3"
                }
            }
        }
    }
}

2.1.2 `组合过滤器`

布尔过滤器 bool
- must:[{1},{2}] 都满足 and
- must_not:[{1},{2}] 都不满足 not
- should:[{1},{2}] 满足一个即可 or

组合 (price=20 or productID=XHDK-A-1293-#fJ3) and price!=30

GET /my_store/products/_search
{
   "query" : {
      "bool" : {
        "should" : [
           { "term" : {"price" : 20}}, 
           { "term" : {"productID" : "XHDK-A-1293-#fJ3"}} 
        ],
        "must_not" : {
           "term" : {"price" : 30} 
        }
     }
   }
}

嵌套 price=30 and (productID!=JODL-X-1937-#pV7)

GET my_store/products/_search
{
  "query": {
    "bool": {
      "must": [
        {"term": {"price": 30}},
        {"bool": {"must_not": [
          {"term": {"productID": "JODL-X-1937-#pV7"}}
        ]}}
      ]
    }
  }
}

2.1.3 `查找多个精确值`

查找 price in (20,30)

GET /my_store/products/_search
{
    "query" : {
        "constant_score" : {
            "filter" : {
                "terms" : { 
                    "price" : [20, 30]
                }
            }
        }
    }
}

2.1.4 `范围`

数值范围 price BETWEEN 20 AND 40

GET /my_store/products/_search
{
    "query" : {
        "constant_score" : {
            "filter" : {
                "range" : {
                    "price" : {
                        "gte" : 20,
                        "lt"  : 40
                    }
                }
            }
        }
    }
}

日期范围
定义日期类型

PUT my_store
{
  "mappings": {
    "products": {
      "properties": {
        "date":{
          "type": "date",
          "format": "yyyy-MM-dd HH:mm:ss"
        }
      }
    }
  }
}

插入数据

POST /my_store/products/_bulk
{ "index": { "_id": 5 }}
{  "date":"2019-10-10 15:35:20"}
{ "index": { "_id": 6 }}
{ "date":"2019-10-09 16:32:12"}
{ "index": { "_id": 7 }}
{ "date":"2019-09-09 16:32:12"}

可以使用now表示当前时间
因为我们定义格式为"yyyy-MM-dd HH:mm:ss" 所有y M d H m s表示年月日时分秒

查询date大于等于当前时间的上一个月

GET my_store/products/_search
{
  "query": {
    "range": {
      "date": {
        "lte": "now-1M"
      }
    }
  }
}

指定时间查询大于"2019-09-10 11:11:11"

GET my_store/products/_search
{
  "query": {
    "range": {
      "date": {
        "gt": "2019-09-10 11:11:11"
      }
    }
  }
}

2.1.5 `处理null值`

查询存在date字段的文档,并且date IS NOT NULL

GET my_store/products/_search
{
  "query": {
    "exists":{
      "field":"date"
    }
  }
}

2.2.0 `全文检索`

写到这里,就不往下写了,这时我去看7.4的官方文档了

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我去年写的数据访问层（EF篇）
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原文地址：https://www.cnblogs.com/taopanfeng/p/11684483.html

Elasticsearch中文文档,内容不全

注意

文档地址

1.0.0 基础入门

1.1.0 你知道的,为了搜索...

1.1.1 索引员工文档

1.1.2 检索文档

1.1.3 轻量搜索

1.1.4 使用查询表达式搜索

1.1.5 更复杂的搜索

1.1.6 全文检索

1.1.7 短语搜索

1.1.8 高亮搜索

1.1.9 分析

1.2.0 集群内的原理

1.2.1 集群健康

1.2.2 添加索引

1.3.0 数据输入和输出

1.3.1 文档元数据

1.3.2 索引文档

1.3.3 取回一个文档

1.3.4 检查文档是否存在

1.3.5 更新整个文档

1.3.6 创建新文档

1.3.7 删除文档

1.3.8 处理冲突

1.3.9 乐观并发控制

1.3.10 文档的部分更新

1.3.11 取回多个文档

1.3.12 代价较小的批量操作

1.4.0 搜索——最基本的工具

1.4.1 多索引,多类型

1.4.2 分页

1.5.0 映射和分析

1.5.1 映射

1.6.0 请求体查询

1.6.1 查询表达式

1.6.2 最重要的查询

1.6.3 组合多查询

1.7.0 排序与相关性

1.7.1 排序

1.7.2 什么是相关性?

1.8.0 索引管理

1.8.1 创建一个索引

1.8.2 删除一个索引

1.8.3 索引设置

1.8.4 索引别名

2.0.0 深入搜索

2.1.0 结构化搜索

2.1.1 精确值查找

2.1.2 组合过滤器

2.1.3 查找多个精确值

2.1.4 范围

2.1.5 处理null值

2.2.0 全文检索