经测试，百度和官网的TransportClient，PreBuiltXPackTransportClient这种方式的密码验证，都会抛错。报错，None of the configured nodes are available，无法连接成功。最后使用RestHighLevelClient，测试通过，浪费了大半天时间。
过程内容如些： pom文件：
<dependency> <groupId>org.elasticsearch</groupId> <artifactId>elasticsearch</artifactId> <version>6.8.4</version> </dependency> <dependency> <groupId>org.elasticsearch.client</groupId> <artifactId>elasticsearch-rest-high-level-client</artifactId> <version>6.8.4</version> </dependency> <dependency> <groupId>org.elasticsearch.client</groupId> <artifactId>elasticsearch-rest-client</artifactId> <version>6.8.4</version> </dependency>config文件
@Bean public RestHighLevelClient client(){ /*用户认证对象*/ final CredentialsProvider credentialsProvider = new BasicCredentialsProvider(); /*设置账号密码*/ credentialsProvider.setCredentials(AuthScope.ANY,new UsernamePasswordCredentials("elastic", "654321")); /*创建rest client对象*/ RestClientBuilder builder = RestClient.builder(new HttpHost("10.20.4.66",9200)) .setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() { @Override public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpAsyncClientBuilder) { return httpAsyncClientBuilder.setDefaultCredentialsProvider(credentialsProvider); } }); RestHighLevelClient client = new RestHighLevelClient(builder); return client; }源码访问地址：https://github.com/viviandavid/springboot-gatherdemo
