elasticsearch 集成springboot 配置

1. 添加依赖

在 `pom.xml` 文件中添加 elasticsearch 和 spring-boot-starter-data-elasticsearch 依赖：

<dependency>
    <groupId>org.elasticsearch</groupId>
    <artifactId>elasticsearch</artifactId>
    <version>6.4.3</version>
</dependency>

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

2. 配置连接信息

在 `application.properties` 文件中配置连接信息：

spring.data.elasticsearch.cluster-nodes=127.0.0.1:9300
spring.data.elasticsearch.cluster-name=my-application

3. 创建 Elasticsearch 配置类

创建一个 Elasticsearch 配置类，用于配置 ElasticsearchTemplate：

@Configuration
public class ElasticsearchConfig {
    @Bean
    public ElasticsearchTemplate elasticsearchTemplate() throws UnknownHostException {
        return new ElasticsearchTemplate(client());
    }

    @Bean
    public Client client() throws UnknownHostException {
        Settings settings = Settings.builder().put("cluster.name", "my-application").build();
        TransportClient client = new PreBuiltTransportClient(settings)
                .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("127.0.0.1"), 9300));
        return client;
    }
}

4. 创建实体类

创建一个实体类，用于映射 Elasticsearch 中的索引：

@Document(indexName = "myindex", type = "mytype")
public class MyEntity {
    @Id
    private String id;
    private String name;
    private String description;

    // getters and setters
}

5. 创建 Elasticsearch Repository

创建一个 Elasticsearch Repository，用于操作 Elasticsearch 中的索引：

public interface MyEntityRepository extends ElasticsearchRepository<MyEntity, String> {
}

6. 使用 Elasticsearch Repository

在需要使用 Elasticsearch 的地方注入 MyEntityRepository，并使用其中的方法对 Elasticsearch 进行操作：

@Autowired
private MyEntityRepository myEntityRepository;

public void search() {
    String query = "test";
    List<MyEntity> result = myEntityRepository.findByNameOrDescription(query, query);
}