Elasticsearch，简称ES，它是个开源分布式搜索引擎
restful风格接口，多数据源，自动搜索负载等PB级别的数据ES也使用Java开发并使用Lucene作为其核心来实现所有索引和搜索的功能，但是它的目的是通过简单的RESTfulAPI来隐藏Lucene的复杂性，从而让全文搜索变得简单Elasticsearch是**面向文档**(document oriented)的
document)index)每个文档的内容使之可以被搜索apt-key的警告，如果不想报警告使用下边这个# 1.wget -qO - https://artifacts.elastic.co/GPG-KEY-elasticsearch |sudo apt-key add -
# 2.curl -s https://artifacts.elastic.co/GPG-KEY-elasticsearch |\sudo gpg --no-default-keyring \
--keyring gnupg-ring:/etc/apt/trusted.gpg.d/icsearch.gpg --import
echo"deb https://artifacts.elastic.co/packages/7.x/apt stable main"\|sudotee /etc/apt/sources.list.d/elasticsearch.list
sudoapt update
sudoapt-getinstallelasticsearch=7.17.21
sudo systemctl start elasticsearch
ik分词器插件：sudo /usr/share/elasticsearch/bin/elasticsearch-plugin install\
https://get.infini.cloud/elasticsearch/analysis-ik/7.17.21
sudo systemctl status elasticsearch.service
curl -X GET "http://localhost:9200/"
IP:PORTvim /etc/elasticsearch/elasticsearch.yml
# 新增配置
network.host: 0.0.0.0
http.port: 9200
cluster.initial_master_nodes: ["node-1"]
# 调整ES虚拟内存，虚拟内存默认最大映射数为65530，无法满足ES系统要求， 需要调整为262144以上
sudo sysctl -w vm.max_map_count=262144
# 增加虚拟机内存配置
sudo vim /etc/elasticsearch/jvm.options
# 新增如下内容
-Xms512m
-Xmx512m
Job for elasticsearch.service failed because the control process exited with error code.
See "systemctl status elasticsearch.service" and "journalctl -xeu elasticsearch.service" for details.
sudoaptinstall kibana
Kibana，配置文件通常位于/etc/kibana/kibana.yml，可能需要设置如服务器地址、端口、Elasticsearch URL等sudo systemctl start kibana
sudo systemctl enable kibana
http://<ip>:5601enabled：是否仅作存储，不做搜索和分析
true(默认)/falseindex：是否构建倒排索引(决定了是否分词，是否被索引)
true(默认)/falseindex_optiondynamic：控制mapping的自动更新
true(默认)/falsedoc_value：是否开启doc_value，用户聚合和排序分析，分词字段不能使用
true(默认)/falsefielddata：是否为text类型启动fielddata，实现排序和聚合分析
doc_valuefielddata":{"format":"disabled"}
store：是否单独设置此字段的是否存储而从_source字段中分离
true/false(默认)coerce：是否开启自动数据类型转换功能，如字符串转整形，浮点转整形
true(默认)/falseanalyzer：指定分词器，默认分词器是standard analyzer”analyzer”: “ik”boost：字段级别的分数加权，默认值是1.0
”boost”: 1.25fields：对一个字段提供多种索引模式，同一个字段的值，一个分词一个不分词"fields":{"raw":{"type":"text","index":"not_analyzed"}}
data_detection：是否自动识别日期类型
true(默认)/false一个文档是一个可被索引的基础信息单元
例如：某一个客户的文档，某一个产品的一个文档或者某个订单的一个文档
index/type里面，可以存储任意多的文档typeElasticsearch与传统关系性数据库相比：
| DB | Database | Table | Row | Column |
|---|---|---|---|---|
| ES | Index | Type | Document | Field |
POST/user/_doc
{"settings":{"analysis":{"analyzer":{"ik":{"tokenizer":"ik_max_word"}}}},"mappings":{"dynamic":true,"properties":{"nickname":{"type":"text","analyzer":"ik_max_word"},"user_id":{"type":"keyword","analyzer":"standard"},"phone":{"type":"keyword","analyzer":"standard"},"description":{"type":"text","enabled":false},"avatar_id":{"type":"keyword","enabled":false}}}}
POST/user/_doc/_bulk
{"index":{"_id":"1"}}{"user_id":"USER4b862aaa-2df8654a-7eb4bb65e3507f66","nickname":"昵称1","phone":"手机号1","description":"签名1","avatar_id":"头像1"}{"index":{"_id":"2"}}{"user_id":"USER14eeeaa5-442771b9-0262e455e4663d1d","nickname":"昵称2","phone":"手机号2","description":"签名2","avatar_id":"头像2"}{"index":{"_id":"3"}}{"user_id":"USER484a6734-03a124f0-996c169dd05c1869","nickname":"昵称3","phone":"手机号3","description":"签名3","avatar_id":"头像3"}{"index":{"_id":"4"}}{"user_id":"USER186ade83-4460d4a6-8c08068f83127b5d","nickname":"昵称4","phone":"手机号4","description":"签名4","avatar_id":"头像4"}{"index":{"_id":"5"}}{"user_id":"USER6f19d074-c33891cf-23bf5a8357189a19","nickname":"昵称5","phone":"手机号5","description":"签名5","avatar_id":"头像5"}{"index":{"_id":"6"}}{"user_id":"USER97605c64-9833ebb7-d045535335a59195","nickname":"昵称6","phone":"手机号6","description":"签名6","avatar_id":"头像6"}
[{"index":{"_id":"1"},"user":{"user_id":"USER4b862aaa-2df8654a-7eb4bb65e3507f66","nickname":"昵称1","phone":"手机号1","description":"签名1","avatar_id":"头像1"}},{"index":{"_id":"2"},"user":{"user_id":"USER14eeeaa5-442771b9-0262e455e4663d1d","nickname":"昵称2","phone":"手机号2","description":"签名2","avatar_id":"头像2"}},{"index":{"_id":"3"},"user":{"user_id":"USER484a6734-03a124f0-996c169dd05c1869","nickname":"昵称3","phone":"手机号3","description":"签名3","avatar_id":"头像3"}},{"index":{"_id":"4"},"user":{"user_id":"USER186ade83-4460d4a6-8c08068f83127b5d","nickname":"昵称4","phone":"手机号4","description":"签名4","avatar_id":"头像4"}},{"index":{"_id":"5"},"user":{"user_id":"USER6f19d074-c33891cf-23bf5a8357189a19","nickname":"昵称5","phone":"手机号5","description":"签名5","avatar_id":"头像5"}},{"index":{"_id":"6"},"user":{"user_id":"USER97605c64-9833ebb7-d045535335a59195","nickname":"昵称6","phone":"手机号6","description":"签名6","avatar_id":"头像6"}}]
GET/user/_doc/_search?pretty
{"query":{"bool":{"must_not":[{"terms":{"user_id.keyword":["USER4b862aaa-2df8654a-7eb4bb65e3507f66","USER14eeeaa5-442771b9-0262e455e4663d1d","USER484a6734-03a124f0-996c169dd05c1869"]}}],"should":[{"match":{"user_id":"昵称"}},{"match":{"nickname":"昵称"}},{"match":{"phone":"昵称"}}]}}}
DELETE/user
POST/user/_doc/_search
{"query":{"match_all":{}}}
elasticlient库MicroHTTPD库sudoapt-getinstall libmicrohttpd-dev
# 克隆代码git clone https://github.com/seznam/elasticlient
# 切换目录cd elasticlient
# 更新子模块git submodule update --init --recursive
# 编译代码make build &&cd build
cmake ..make# 安装makeinstall
/**
* Perform search on nodes until it is successful. Throws
exception if all nodes
* has failed to respond.
* \param indexName specification of an Elasticsearch index.
* \param docType specification of an Elasticsearch document type.
* \param body Elasticsearch request body.
* \param routing Elasticsearch routing. If empty, no routing has
been used.
*
* \return cpr::Response if any of node responds to request.
* \throws ConnectionException if all hosts in cluster failed to
respond.
*/
cpr::Response search(const std::string &indexName,const std::string &docType,const std::string &body,const std::string &routing = std::string());/**
* Get document with specified id from cluster. Throws exception
if all nodes
* has failed to respond.
* \param indexName specification of an Elasticsearch index.
* \param docType specification of an Elasticsearch document type.
* \param id Id of document which should be retrieved.
* \param routing Elasticsearch routing. If empty, no routing has
been used.
*
* \return cpr::Response if any of node responds to request.
* \throws ConnectionException if all hosts in cluster failed to
respond.
*/
cpr::Response get(const std::string &indexName,const std::string &docType,const std::string &id = std::string(),const std::string &routing = std::string());/**
* Index new document to cluster. Throws exception if all nodes
has failed to respond.
* \param indexName specification of an Elasticsearch index.
* \param docType specification of an Elasticsearch document type.
* \param body Elasticsearch request body.
* \param id Id of document which should be indexed. If empty, id
will be generated
* automatically by Elasticsearch cluster.
* \param routing Elasticsearch routing. If empty, no routing has
been used.
*
* \return cpr::Response if any of node responds to request.
* \throws ConnectionException if all hosts in cluster failed to
respond.
*/
cpr::Response index(const std::string &indexName,const std::string &docType,const std::string &id,const std::string &body,const std::string &routing = std::string());/**
* Delete document with specified id from cluster. Throws
exception if all nodes
* has failed to respond.
* \param indexName specification of an Elasticsearch index.
* \param docType specification of an Elasticsearch document type.
* \param id Id of document which should be deleted.
* \param routing Elasticsearch routing. If empty, no routing has
been used.
*
* \return cpr::Response if any of node responds to request.
* \throws ConnectionException if all hosts in cluster failed to
respond.
*/
cpr::Response remove(const std::string &indexName,const std::string &docType,const std::string &id,const std::string &routing = std::string());
http://127.0.0.1:9200/#include<iostream>#include<elasticlient/client.h>#include<cpr/cpr.h>intmain(){// 1.构造ES客户端
elasticlient::Client client({"http://127.0.0.1:9200/"});// 2.发起搜索请求try{auto resp = client.search("user","_doc","{\"query\": { \"match_all\":{} }}");
std::cout << resp.status_code << std::endl;
std::cout << resp.text << std::endl;}catch(std::exception &e){
std::cout << e.what()<< std::endl;return-1;}return0;}
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