报错内容如下：

Elasticsearch health check failed

java.net.ConnectException: Connection refused: getsockopt
    at org.elasticsearch.client.RestClient.extractAndWrapCause(RestClient.java:932) ~[elasticsearch-rest-client-7.17.9.jar:7.17.9]
    at org.elasticsearch.client.RestClient.performRequest(RestClient.java:300) ~[elasticsearch-rest-client-7.17.9.jar:7.17.9]
    at org.elasticsearch.client.RestClient.performRequest(RestClient.java:288) ~[elasticsearch-rest-client-7.17.9.jar:7.17.9]
    at org.springframework.boot.actuate.elasticsearch.ElasticsearchRestClientHealthIndicator.doHealthCheck(ElasticsearchRestClientHealthIndicator.java:60) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at org.springframework.boot.actuate.health.AbstractHealthIndicator.health(AbstractHealthIndicator.java:82) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at org.springframework.boot.actuate.health.HealthIndicator.getHealth(HealthIndicator.java:37) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at org.springframework.boot.actuate.health.HealthEndpoint.getHealth(HealthEndpoint.java:94) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at org.springframework.boot.actuate.health.HealthEndpoint.getHealth(HealthEndpoint.java:41) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at org.springframework.boot.actuate.health.HealthEndpointSupport.getLoggedHealth(HealthEndpointSupport.java:172) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at org.springframework.boot.actuate.health.HealthEndpointSupport.getContribution(HealthEndpointSupport.java:145) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at org.springframework.boot.actuate.health.HealthEndpointSupport.getAggregateContribution(HealthEndpointSupport.java:156) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at org.springframework.boot.actuate.health.HealthEndpointSupport.getContribution(HealthEndpointSupport.java:141) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at org.springframework.boot.actuate.health.HealthEndpointSupport.getHealth(HealthEndpointSupport.java:110) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at org.springframework.boot.actuate.health.HealthEndpointSupport.getHealth(HealthEndpointSupport.java:81) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at org.springframework.boot.actuate.health.HealthEndpoint.health(HealthEndpoint.java:88) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at org.springframework.boot.actuate.health.HealthEndpoint.health(HealthEndpoint.java:78) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:569) ~[na:na]
    at org.springframework.util.ReflectionUtils.invokeMethod(ReflectionUtils.java:282) ~[spring-core-5.3.27.jar:5.3.27]
    at org.springframework.boot.actuate.endpoint.invoke.reflect.ReflectiveOperationInvoker.invoke(ReflectiveOperationInvoker.java:74) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at org.springframework.boot.actuate.endpoint.annotation.AbstractDiscoveredOperation.invoke(AbstractDiscoveredOperation.java:60) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at org.springframework.boot.actuate.endpoint.jmx.EndpointMBean.invoke(EndpointMBean.java:124) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at org.springframework.boot.actuate.endpoint.jmx.EndpointMBean.invoke(EndpointMBean.java:97) ~[spring-boot-actuator-2.7.11.jar:2.7.11]
    at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:814) ~[na:na]
    at java.management/com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:802) ~[na:na]
    at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1472) ~[na:na]
    at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1310) ~[na:na]
    at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1405) ~[na:na]
    at java.management.rmi/javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829) ~[na:na]
    at java.base/jdk.internal.reflect.GeneratedMethodAccessor28.invoke(Unknown Source) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:569) ~[na:na]
    at java.rmi/sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:360) ~[na:na]
    at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:200) ~[na:na]
    at java.rmi/sun.rmi.transport.Transport$1.run(Transport.java:197) ~[na:na]
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:712) ~[na:na]
    at java.rmi/sun.rmi.transport.Transport.serviceCall(Transport.java:196) ~[na:na]
    at java.rmi/sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:587) ~[na:na]
    at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828) ~[na:na]
    at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:705) ~[na:na]
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399) ~[na:na]
    at java.rmi/sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:704) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635) ~[na:na]
    at java.base/java.lang.Thread.run(Thread.java:840) ~[na:na]
Caused by: java.net.ConnectException: Connection refused: getsockopt
    at java.base/sun.nio.ch.Net.pollConnect(Native Method) ~[na:na]
    at java.base/sun.nio.ch.Net.pollConnectNow(Net.java:672) ~[na:na]
    at java.base/sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:946) ~[na:na]
    at org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvent(DefaultConnectingIOReactor.java:174) ~[httpcore-nio-4.4.16.jar:4.4.16]
    at org.apache.http.impl.nio.reactor.DefaultConnectingIOReactor.processEvents(DefaultConnectingIOReactor.java:148) ~[httpcore-nio-4.4.16.jar:4.4.16]
    at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor.execute(AbstractMultiworkerIOReactor.java:351) ~[httpcore-nio-4.4.16.jar:4.4.16]
    at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.execute(PoolingNHttpClientConnectionManager.java:221) ~[httpasyncclient-4.1.5.jar:4.1.5]
    at org.apache.http.impl.nio.client.CloseableHttpAsyncClientBase$1.run(CloseableHttpAsyncClientBase.java:64) ~[httpasyncclient-4.1.5.jar:4.1.5]
    ... 1 common frames omitted

检查了网络情况，在cmd中运行：（使用账号密码连接的）

curl -u elastic:123456 http://192.168.8.238:9200

输出：

{
  "name" : "30423e427daf",
  "cluster_name" : "docker-cluster",
  "cluster_uuid" : "Wx-VbyKUQBqrk-zY5reSmg",
  "version" : {
    "number" : "7.11.2",
    "build_flavor" : "default",
    "build_type" : "docker",
    "build_hash" : "3e5a16cfec50876d20ea77b075070932c6464c7d",
    "build_date" : "2021-03-06T05:54:38.141101Z",
    "build_snapshot" : false,
    "lucene_version" : "8.7.0",
    "minimum_wire_compatibility_version" : "6.8.0",
    "minimum_index_compatibility_version" : "6.0.0-beta1"
  },
  "tagline" : "You Know, for Search"
}

证明es服务和连接没有问题

最后发现是配置文件的问题：

原yml文件(有问题)：

spring:
  data:
    elasticsearch:
      uris: http://192.168.8.172:9200
      username: elastic
      password: 123456

后来改为以下：（就没问题了）

spring:
  elasticsearch:
    uris: http://192.168.8.172:9200
    username: elastic
    password: 123456

不过仍然可以使用配置类的方式解决：（不推荐，显示已弃用）

@Data
@Configuration
@ConfigurationProperties(prefix = "spring.data.elasticsearch")
public class ElasticsearchConfig {
    private String uris;
    private String username;
    private String password;

    @Bean
    public RestHighLevelClient restHighLevelClient() {
        // 创建 ClientConfiguration
        ClientConfiguration clientConfiguration = ClientConfiguration.builder()
                .connectedTo(uris)
                .withBasicAuth(username, password)
                .build();

        // 创建 RestHighLevelClient
        return RestClients.create(clientConfiguration).rest();
    }

    @Bean
    public ElasticsearchRestTemplate elasticsearchRestTemplate(RestHighLevelClient restHighLevelClient) {
        return new ElasticsearchRestTemplate(restHighLevelClient);
    }
}

报错分析：

因为本次集成ElasticSearch只添加了一个SpringData依赖：

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-elasticsearch</artifactId>
            <version>2.7.11</version>
        </dependency>

使用的是：

    @Autowired
    private ElasticsearchRestTemplate elasticTemplate;

正常说应该是读取配置文件自动创建ElasticsearchRestTemplate，很容易得出应该是配置文件加载过程中报错，导致连接es出现问题。

但是坑爹的是DeepSeek和kimi都一致认为原yml文件没有问题，而且我的配置文件是从nacos配置中心取的，在写配置文件的时候没有提示，由于使用的是spring data，刚开始我也没怀疑。

当我新建一个demo项目连接es时，在写yml文件的时候发现这个yml配置问题的。

这种spring.data.elasticsearch显示已被弃用：