Es8.12Java基本操作

第一步：引入依赖

    co.elastic.clients
    elasticsearch-java
    8.1.2


    jakarta.json
    jakarta.json-api

第二步：配置文件

elasticsearch:
  rest:
    host: localhost
    port: 9200
    scheme: http
    read-timeout: 20
    userName: root
    password: root

  第三步：读取配置文件 加ES保活策略

/**
 * @Author D_TZ
 * @Date 2022/11/314:16
 * @ClassName ElashConfig
 * @Desription
 **/
@Configuration
public class ElasticSearchConfig {

    @Value("${elasticsearch.rest.host}")
    private String host;

    @Value("${elasticsearch.rest.scheme}")
    private String scheme;

    @Value("${elasticsearch.rest.port}")
    private int port;

    @Value("${elasticsearch.rest.userName}")
    private String userName;

    @Value("${elasticsearch.rest.password}")
    private String password;
    @Bean
    public ElasticsearchClient elasticsearchClient(){
        ElasticsearchClient client = new ElasticsearchClient(null);
        final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        //设置账号密码
        credentialsProvider.setCredentials(
                AuthScope.ANY, new UsernamePasswordCredentials(userName, password));

        RestClient restClient = RestClient.builder(new HttpHost(host, port,scheme))
                // 异步httpclient配置
                .setHttpClientConfigCallback( httpClientBuilder -> {
                            // 账号密码登录
                            httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
                            // httpclient保活策略
                            httpClientBuilder.setKeepAliveStrategy(((response, context) -> Duration.ofMinutes(5).toMillis()));
                            return httpClientBuilder;
                }).build();

        ElasticsearchTransport transport = new RestClientTransport(restClient,new JacksonJsonpMapper());
        // And create the API client
        client = new ElasticsearchClient(transport);
        return client;
    }

第四步使用：注入 ElasticsearchClient 只截取主要代码部分

@Autowired
private ElasticsearchClient client;

/**
 * 首页成果查询
 *
 * @param dto
 * @return
 * @Author D_TZ
 */
@Override
public AjaxResult esSearch(EsSearchDto dto) {
    //检查参数
    if (dto == null || StringUtils.isBlank(dto.getKeyword())) {
        return AjaxResult.error("缺少搜索参数");
    }

SearchResponse