compatible version of org.elasticsearch.client.RestHighLevelClient

一、异常现象：
springboot 整合elasticsearch 5.6.8版本。出现此异常，低版本es服务使用高版本es客户端连接

An attempt was made to call the method org.elasticsearch.client.RestHighLevelClient.(Lorg/elasticsearch/client/RestClientBuilder;)V but it does not exist. Its class, org.elasticsearch.client.RestHighLevelClient, is available from the following locations:

jar:file:/path/application/target/application-0.0.1-SNAPSHOT.jar!/BOOT-INF/lib/elasticsearch-rest-high-level-client-5.6.3.jar!/org/elasticsearch/client/RestHighLevelClient.class

It was loaded from the following location:

jar:file:/path/application/target/application-0.0.1-SNAPSHOT.jar!/BOOT-INF/lib/elasticsearch-rest-high-level-client-5.6.3.jar!/

Action:

Correct the classpath of your application so that it contains a single, compatible version of org.elasticsearch.client.RestHighLevelClient

pom.xml

		
            org.elasticsearch
            elasticsearch
            5.6.8
        
        
            org.elasticsearch.client
            elasticsearch-rest-client
            5.6.8
        
        
            org.elasticsearch.client
            elasticsearch-rest-high-level-client
            5.6.8
            
                
                    elasticsearch
                    org.elasticsearch
                
                
                    elasticsearch-rest-client
                    org.elasticsearch.client
                
            
        

该应用程序的构建没有错误,并且我的maven存储库中只有一个版本的elasticsearch SDK.

初始化方式：

@Slf4j
@Configuration
public class ElasticSearchConfig {

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

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

    @Value("${spring.elasticsearch.index}")
    private String indexName;

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

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

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

    @Value("${spring.elasticsearch.auth}")
    private Boolean auth;

    @Bean
    @Primary
    public RestHighLevelClient restHighLevelClient() {
        final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(username, password));
        RestClient restClient;
        if (auth) {
            restClient = RestClient.builder(new HttpHost(host, port))
                    .setHttpClientConfigCallback(httpClientBuilder -> httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider)).build();
        } else {
            restClient = RestClient.builder(new HttpHost(host, port)).build();
        }
        return new RestHighLevelClient(restClient);
    }
}

二、解决方案
原因是：Spring Boot将尝试自动配置elasticsearch,该搜索将在内部使用Elastic 6， RestHighLevelClient(org.elasticsearch.client.RestClientBuilder builder)创建弹性客户端.如果要连接到旧版本的elasticsearch,请排除elasticsearch自动配置，在配置类上添加改配置方式就可以正常启动了

@EnableAutoConfiguration(exclude={ElasticsearchAutoConfiguration.class, RestClientAutoConfiguration.class})