Elasticsearch

安装：

docker run --name elasticsearch -p 9200:9200 -p 9300:9300 -e "discovery.type=single-node" -e ES_JAVA_OPTS="-Xms64m -Xmx512m" -v /mydata/elasticsearch/config/elasticsearch.yml:/usr/share/elasticsearch/config/elasticsearch.yml -v /mydata/elasticsearch/data:/usr/share/elasticsearch/data -v /mydata/elasticsearch/plugins:/usr/share/elasticsearch/plugins -d elasticsearch:7.4.2
修改文件夹访问权限：
chmod -R 777 /mydata/elasticsearch/

安装：

docker run --name kibana -e ELASTICSEARCH_HOSTS=http://192.168.56.10:9200 -p 5601:5601 -d kibana:7.4.2

设置开机自启动：
docker update ece --restart=always
docker update cd8 --restart=always

配置远程扩展字典：

[root@loaclhost mydata]# ls
elasticsearch  mysql  nginx  redis
[root@loaclhost mydata]# cd elasticsearch/
[root@loaclhost elasticsearch]# ls
config  data  plugins
[root@loaclhost elasticsearch]# cd plugins/
[root@loaclhost plugins]# ls
ik
[root@loaclhost plugins]# cd ik
[root@loaclhost ik]# ls
commons-codec-1.9.jar  commons-logging-1.2.jar  config  elasticsearch-analysis-ik-7.4.2.jar  httpclient-4.5.2.jar  httpcore-4.4.4.jar  plugin-descriptor.properties  plugin-security.policy
[root@loaclhost ik]# cd config/
[root@loaclhost config]# ls
extra_main.dic         extra_single_word_full.dic      extra_stopword.dic  main.dic         quantifier.dic  suffix.dic
extra_single_word.dic  extra_single_word_low_freq.dic  IKAnalyzer.cfg.xml  preposition.dic  stopword.dic    surname.dic
[root@loaclhost config]# cat IKAnalyzer.cfg.xml 
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE properties SYSTEM "http://java.sun.com/dtd/properties.dtd">
<properties>
    <comment>IK Analyzer 扩展配置</comment>
    <!--用户可以在这里配置自己的扩展字典 -->
    <entry key="ext_dict"></entry>
     <!--用户可以在这里配置自己的扩展停止词字典-->
    <entry key="ext_stopwords"></entry>
    <!--用户可以在这里配置远程扩展字典 -->
    <entry key="remote_ext_dict">http://192.168.56.10/es/fenci.txt</entry>
    <!--用户可以在这里配置远程扩展停止词字典-->
    <!-- <entry key="remote_ext_stopwords">words_location</entry> -->
</properties>
[root@loaclhost config]# 

es目录：

t/mydata/nginx/html/es

添加客户端：<dependency>

    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.4.2</version>
</dependency>


配置文件：

@Configuration
public class GulimallElasticSearchConfig {

    // 单例的
    public static final RequestOptions COMMON_OPTIONS;
    static {
        RequestOptions.Builder builder = RequestOptions.DEFAULT.toBuilder();
//        builder.addHeader("Authorization", "Bearer " + TOKEN);
//        builder.setHttpAsyncResponseConsumerFactory(
//                new HttpAsyncResponseConsumerFactory
//                        .HeapBufferedResponseConsumerFactory(30 * 1024 * 1024 * 1024));
        COMMON_OPTIONS = builder.build();
    }

    @Bean
    public RestHighLevelClient restHighLevelClient() {
        RestHighLevelClient client = new RestHighLevelClient(RestClient.builder(new HttpHost("192.168.56.10", 9200, "http")));
        return client;
    }
}
构建检索请求：

1.构建bool - query

2.排序，分页，高亮
3.聚合（类似于sql中的group by）

客户端执行检索