我试图在Docker环境中设置Spring应用程序和Elasticsearch之间的通信，但当我运行程序时，我得到以下警告：

.d.e.r.s.AbstractElasticsearchRepository：无法创建索引：连接被拒绝;嵌套异常为java.lang.RuntimeException：拒绝连接

在浏览器中输入命令时：http：//localhost：9200/article/_search？pretty=true，我得到的信息是索引不存在
我尝试在docker-compose和spring应用程序中更改不同的配置，但无法修复错误
但是，当我手动运行程序时（* 没有Docker容器化 *），那么程序就能正常工作
我的docker-compose.yml配置已经尽量简化：

version: '3'

services:

  demo:
    container_name: demo
    image: demo-elastic
    build: .
    ports:
      - "8080:8080"
    depends_on:
      - es
    networks:
      - demo-network

  es:
    image: elasticsearch:7.6.2
    environment:
      - discovery.type=single-node
    ports:
      - "9200:9200"
    networks:
      - demo-network

networks:
  demo-network:
    driver: bridge

标准Dockerfile

# For Java 11
FROM adoptopenjdk/openjdk11:alpine-jre

ARG JAR_FILE=target/*.jar

COPY ${JAR_FILE} demo.jar

ENTRYPOINT ["java","-jar","/demo.jar"]

Config.javajava应用中Elasticsearch配置文件

@Configuration
@EnableElasticsearchRepositories(basePackages = "com.example.demo.repository")
public class Config extends AbstractElasticsearchConfiguration {

    @Value("${elasticsearch.url}")
    public String elasticsearchUrl;

    @Bean
    @Override
    public RestHighLevelClient elasticsearchClient() {
        final ClientConfiguration config = ClientConfiguration.builder()
                .connectedTo(elasticsearchUrl)
                .build();

        return RestClients.create(config).rest();
    }
}

应用.属性

elasticsearch.url=localhost:9200
spring.data.elasticsearch.cluster-nodes=localhost:9200

pom.xml文件中的主要依赖。Sping Boot 版本是2.7.5

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.elasticsearch/elasticsearch -->
        <dependency>
            <groupId>org.elasticsearch</groupId>
            <artifactId>elasticsearch</artifactId>
            <version>7.6.2</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.elasticsearch.client/elasticsearch-rest-high-level-client -->
        <dependency>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-high-level-client</artifactId>
            <version>7.6.2</version>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.data/spring-data-elasticsearch -->
        <dependency>
            <groupId>org.springframework.data</groupId>
            <artifactId>spring-data-elasticsearch</artifactId>
            <version>4.0.0.RELEASE</version>
        </dependency>

        <dependency>
            <groupId>junit</groupId>
            <artifactId>junit</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-test</artifactId>
        </dependency>

    </dependencies>