springboot怎样使用ElasticSearch

Spring Boot可以通过Elasticsearch的Java API来使用Elasticsearch。首先，需要在pom.xml文件中添加Elasticsearch的依赖：

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>7.9.3</version>
</dependency>

然后，在Spring Boot的配置文件中配置Elasticsearch的连接信息：

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

最后，在代码中使用Elasticsearch的Java API进行操作，例如：

@Autowired
private RestHighLevelClient restHighLevelClient;

public void search() throws IOException {
    SearchRequest searchRequest = new SearchRequest("index");
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    searchSourceBuilder.query(QueryBuilders.matchQuery("field", "value"));
    searchRequest.source(searchSourceBuilder);
    SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    // 处理搜索结果
}

这样就可以使用Spring Boot来操作Elasticsearch了。