Spring Boot 3.3.3连接Elasticsearch 8.13.0报媒体类型头异常求助

问题复现 #

启动Spring Boot服务时抛出Elasticsearch媒体类型头异常：

co.elastic.clients.elasticsearch._types.ElasticsearchException: [es/indices.create] failed: [media_type_header_exception] Invalid media-type value on headers [Content-Type, Accept]

手动添加Accept头后，错误简化为：

Invalid media-type value on headers [Accept]

问题原因 #

你通过ContentType.APPLICATION_JSON.toString()获取的媒体类型字符串默认携带charset=UTF-8后缀（实际值为application/json;charset=UTF-8），而Elasticsearch 8.x对请求头的媒体类型校验严格，不允许附加charset参数，因此触发了异常。

修复方案 #

直接使用纯字符串"application/json"设置Content-Type和Accept头，避免携带多余的charset参数。修改后的RestClient配置如下：

@Bean
public RestClient restClient() {
    final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
    credentialsProvider.setCredentials(AuthScope.ANY,
            new UsernamePasswordCredentials(elasticCredentials.getUsername(), elasticCredentials.getPassword()));

    return RestClient.builder(new HttpHost(elasticProperties.getHost(), elasticProperties.getPort()))
            .setHttpClientConfigCallback(httpClientBuilder -> {
                httpClientBuilder.disableAuthCaching();
                httpClientBuilder.setDefaultHeaders(List.of(
                        new BasicHeader(HttpHeaders.CONTENT_TYPE, "application/json"),
                        new BasicHeader(HttpHeaders.ACCEPT, "application/json")
                ));
                httpClientBuilder.addInterceptorLast((HttpResponseInterceptor)
                        (response, context) ->
                                response.addHeader("X-Elastic-Product", "Elasticsearch"));
                return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
            }).build();
}

额外说明 #

如果需要适配Elasticsearch 8.x的专属媒体格式，也可以将Accept头设置为"application/vnd.elasticsearch+json;compatible-with=8"，同样要确保字符串不包含任何额外参数。

内容的提问来源于stack exchange，提问作者Danzilla