spring boot 集成es 7.0

要在 Spring Boot 中集成 Elasticsearch 7.0，可以按照以下步骤操作：

1. 在 pom.xml 文件中添加 Elasticsearch 相关依赖：

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.0.0</version>
</dependency>
<dependency>
    <groupId>org.elasticsearch</groupId>
    <artifactId>elasticsearch</artifactId>
    <version>7.0.0</version>
</dependency>

2. 创建 Elasticsearch 配置类 ElasticsearchConfig.java，用于配置 Elasticsearch 连接参数，例如：

@Configuration
public class ElasticsearchConfig {

    private static final String HOST = "localhost";
    private static final int PORT = 9200;
    private static final String SCHEME = "http";

    @Bean
    public RestHighLevelClient restHighLevelClient() {
        RestClientBuilder builder = RestClient.builder(
                new HttpHost(HOST, PORT, SCHEME));
        return new RestHighLevelClient(builder);
    }
}

3. 在需要使用 Elasticsearch 的 Service 类中注入 RestHighLevelClient：

@Service
public class MyService {

    @Autowired
    private RestHighLevelClient restHighLevelClient;

    // ...
}

4. 在 Service 类中使用 RestHighLevelClient 调用 Elasticsearch API，例如：

public void search() throws IOException {
    SearchRequest searchRequest = new SearchRequest("my-index");
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    searchSourceBuilder.query(QueryBuilders.matchQuery("title", "java"));
    searchRequest.source(searchSourceBuilder);
    SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    SearchHits hits = searchResponse.getHits();
    // ...
}

以上就是在 Spring Boot 中集成 Elasticsearch 7.0 的基本步骤，具体使用可以根据自己的需求进行调整。