co.elastic.clients.transport.TransportException: [es/indices.exists] Missing [X-Elastic-Product] header

问题记录

这里记录一次 远程连接 es8.6.2，账号密码方式安全连接的一次问题解决，
**

注意*******：

es8.6.2安全连接参考地址：https://cloud.tencent.com/developer/article/2046642

补充， 按照以上地址配置es 理论上是不会出现[X-Elastic-Product] header 这个问题的，所以请先确认

es的证书（及服务器上配置es后生成的后缀名为 .crt文件）

es集群地址

以及账号密码配置

是否正确，如果都正确可以试试下面的办法，希望能给你带来帮助

ClientConfig 的111行 及方法getElasticsearchTransport 是解决问题的关键

ymal

spring.elasticsearch.uris=172.0.0.1:9200,172.0.0.2:9200,172.0.0.3:9200
spring.elasticsearch.username=root
spring.elasticsearch.password=123456
spring.elasticsearch.connection-timeout=10000
spring.elasticsearch.socket-timeout=30s

ClientConfig

package com.relaper.iot.es.app.test.config;

import co.elastic.clients.elasticsearch.ElasticsearchClient;
import co.elastic.clients.json.jackson.JacksonJsonpMapper;
import co.elastic.clients.transport.ElasticsearchTransport;
import co.elastic.clients.transport.rest_client.RestClientTransport;
import lombok.Setter;
import lombok.extern.slf4j.Slf4j;
import org.apache.http.Header;
import org.apache.http.HttpHeaders;
import org.apache.http.HttpHost;
import org.apache.http.HttpResponseInterceptor;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.client.CredentialsProvider;
import org.apache.http.conn.ssl.NoopHostnameVerifier;
import org.apache.http.entity.ContentType;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.apache.http.message.BasicHeader;
import org.apache.http.ssl.SSLContextBuilder;
import org.apache.http.ssl.SSLContexts;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder.HttpClientConfigCallback;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.util.StringUtils;

import javax.net.ssl.SSLContext;
import java.io.IOException;
import java.io.InputStream;
import java.security.KeyManagementException;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.cert.Certificate;
import java.security.cert.CertificateException;
import java.security.cert.CertificateFactory;
import java.util.List;


@ConfigurationProperties(prefix = "spring.elasticsearch") //配置的前缀
@Configuration
@Slf4j
public class ClientConfig {
    @Setter
    private String uris;
    @Setter
    private String username;
    @Setter
    private String passwd;
//    @Setter
//    private String apikey;

    /**
     * 解析配置的字符串，转为HttpHost对象数组
     *
     * @return
     */
    private HttpHost[] toHttpHost() {
        if (!StringUtils.hasLength(uris)) {
            throw new RuntimeException("invalid elasticsearch configuration");
        }
        String[] hostArray = uris.split(",");
        HttpHost[] httpHosts = new HttpHost[hostArray.length];
        HttpHost httpHost;
        for (int i = 0; i < hostArray.length; i++) {
             String[] strings = hostArray[i].split(":");
            httpHost = new HttpHost(strings[0], Integer.parseInt(strings[1]), "https");
            httpHosts[i] = httpHost;
        }
        return httpHosts;
    }

    @Bean("clientByPasswd")
    public ElasticsearchClient clientByPasswd() throws Exception {
        ElasticsearchTransport transport = getElasticsearchTransport(username, passwd, toHttpHost());
        return new ElasticsearchClient(transport);
    }

    private static SSLContext buildSSLContext() {
        ClassPathResource resource = new ClassPathResource("es01.crt");
        SSLContext sslContext = null;
        try {
            CertificateFactory factory = CertificateFactory.getInstance("X.509");
            Certificate trustedCa;
            try (InputStream is = resource.getInputStream()) {
                trustedCa = factory.generateCertificate(is);
            }
            KeyStore trustStore = KeyStore.getInstance("pkcs12");
            trustStore.load(null, null);
            trustStore.setCertificateEntry("ca", trustedCa);
            SSLContextBuilder sslContextBuilder = SSLContexts.custom()
                    .loadTrustMaterial(trustStore, null);
            sslContext = sslContextBuilder.build();
        } catch (CertificateException | IOException | KeyStoreException | NoSuchAlgorithmException |
                KeyManagementException e) {
            log.error("ES连接认证失败", e);
        }
        return sslContext;
    }

    private static ElasticsearchTransport getElasticsearchTransport(String username, String passwd, HttpHost... hosts) {
        // 账号密码的配置
        final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(username, passwd));
        // 自签证书的设置，并且还包含了账号密码
        HttpClientConfigCallback callback = httpAsyncClientBuilder -> httpAsyncClientBuilder
//                .setSSLContext(buildSSLContext())    //  证书式认证方式
                .setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE)
                .setDefaultCredentialsProvider(credentialsProvider)
                //  Todo 这里是关键  ######################解决 X-Elastic-Product  问题开始
                .setDefaultHeaders(
                        List.of(
                                new BasicHeader(
                                        HttpHeaders.CONTENT_TYPE, ContentType.APPLICATION_JSON.toString())))
                .addInterceptorLast(
                        (HttpResponseInterceptor)
                                (response, context) ->
                                        response.addHeader("X-Elastic-Product", "Elasticsearch"));
                                        // X-Elastic-Product   end
        // 用builder创建RestClient对象
        RestClient client = RestClient
                .builder(hosts)
                .setHttpClientConfigCallback(callback)
                .build();
        return new RestClientTransport(client, new JacksonJsonpMapper());
    }

    private static ElasticsearchTransport getElasticsearchTransport(String apiKey, HttpHost... hosts) {
        // 将ApiKey放入header中
        Header[] headers = new Header[]{new BasicHeader("Authorization", "ApiKey " + apiKey)};
        // es自签证书的设置
        HttpClientConfigCallback callback = httpAsyncClientBuilder -> httpAsyncClientBuilder
                .setSSLContext(buildSSLContext())
                .setSSLHostnameVerifier(NoopHostnameVerifier.INSTANCE);
        // 用builder创建RestClient对象
        RestClient client = RestClient
                .builder(hosts)
                .setHttpClientConfigCallback(callback)
                .setDefaultHeaders(headers)
                .build();
        return new RestClientTransport(client, new JacksonJsonpMapper());
    }

//    @Bean
//    public ElasticsearchClient clientByApiKey() throws Exception {
//        ElasticsearchTransport transport = getElasticsearchTransport(apikey, toHttpHost());
//        return new ElasticsearchClient(transport);
//    }
}

好了以上配置文件亲测可用，希望能帮助到各位，节省各位的宝贵时间，88

参考文献：
https://stackoverflow.com/questions/71142680/co-elastic-clients-transport-transportexception-es-search-missing-x-elastic