你需要更新你的版本依赖或添加兼容性头（https://docs.spring.io/spring-data/elasticsearch/docs/current/reference/html/），就我的情况而言，即使是最新版本的Spring-data-elastic search也不支持版本8+的Elastic Search。不得不这样配置我的客户端：

@Configuration
@EnableElasticsearchRepositories(basePackages = "*")
public class ElasticsearchClientConfig {

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

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

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

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

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

  @Bean(destroyMethod = "close")
  public RestHighLevelClient restClient() {

    final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
    credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(userName, password));

    RestClientBuilder builder = RestClient.builder(new HttpHost(host, port, protocol))
            .setHttpClientConfigCallback(httpClientBuilder -> httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider))
            .setDefaultHeaders(compatibilityHeaders());

    return new RestHighLevelClient(builder);
  }

  private Header[] compatibilityHeaders() {
    return new Header[]{new BasicHeader(HttpHeaders.ACCEPT, "application/vnd.elasticsearch+json;compatible-with=7"), new BasicHeader(HttpHeaders.CONTENT_TYPE, "application/vnd.elasticsearch+json;compatible-with=7")};
 }

}

这里需要考虑两件事。下面的示例由连接到Elasticsearch 8.5集群的代码组成。
1.添加自定义页眉

@Bean(name = "client", destroyMethod = "close")
 public RestHighLevelClient client() {

     String uri = applicationConfig.getElasticSearchDB();
     String[] hosts = uri.split(Constants.COMMA);
     List<HttpHost> httpHosts = new ArrayList<>();
     Arrays.stream(hosts).forEach(a -> httpHosts.add(new HttpHost(String.valueOf(a.split(Constants.COLON)[0]), Integer.parseInt(a.split(Constants.COLON)[1]), "http")));

     HttpHost[] esHosts = new HttpHost[httpHosts.size()];
     httpHosts.toArray(esHosts);

     return new RestHighLevelClient(RestClient
             .builder(esHosts)
             .setDefaultHeaders(compatibilityHeaders()));
 }

 private Header[] compatibilityHeaders() {
     return new Header[]{
             new BasicHeader(HttpHeaders.ACCEPT, "application/vnd.elasticsearch+json;compatible-with=7"),
             new BasicHeader(HttpHeaders.CONTENT_TYPE, "application/vnd.elasticsearch+json;compatible-with=7")
     };
 }

1.正在验证依赖模块

• 如果spring-boot-starter-data-elasticsearch用作依赖项，请使用https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-data-elasticsearch检查您需要的有效版本
• 在我的例子中，因为我使用的是Elasticsearch版本8.5，我不得不在我的POM中使用下面的。你可以在上面的网页中检查Compile Dependencies部分，以检查你需要使用哪个版本。

<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
      <version>3.0.5</version>
  </dependency>