【ES】Elasticsearch-7.4.1-RestHighLevelClient

千万级数据在PostgresSQL数据库中，查询有点慢，换了Elasticsearch，搜索速度很快

SpringCloud版本固定，只能适配，所以采用RestHighLevelClient

关闭连接：

restHighLevelClient.close();

依赖

<dependency>
    <groupId>org.elasticsearch.clientgroupId>
    <artifactId>elasticsearch-rest-high-level-clientartifactId>
    <version>7.4.1version>
dependency>

<properties>
	<elasticsearch.version>7.4.1elasticsearch.version>
properties>

初始化连接

@Configuration
public class EsConfig {
   

    public static final RequestOptions COMMON_OPTIONS;

    static {
   
        RequestOptions.Builder builder = RequestOptions.DEFAULT.toBuilder();
        COMMON_OPTIONS = builder.build();
    }

    @Bean
    public RestHighLevelClient esClient() {
   
        RestHighLevelClient restHighLevelClient = new RestHighLevelClient(RestClient.builder(
                new HttpHost("ip1", 9200, "http"),
                // 集群
                new HttpHost("ip1", 9201, "http")
        ));
        return restHighLevelClient;
    }

    @Bean
    public RestHighLevelClient esClient2() {
   
        RestClientBuilder builder = RestClient.builder(
                new HttpHost("ip1", 9200, "http"),
                new HttpHost("ip2", 9200, "http"),
                new HttpHost("ip3", 9200, "http"));
        // 这里就是不一样的
        CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials("username", "password"));
        // 用户名和密码传入的地方
        builder.setHttpClientConfigCallback(f -> f.setDefaultCredentialsProvider(credentialsProvider));
        return new RestHighLevelClient(builder);
    }

}

总览

//增, source 里对象创建方式可以是JSON字符串，或者Map，或者XContentBuilder 对象
IndexRequest indexRequest = new