ElasticSearch与项目的整合使用

import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.sort.SortOrder;
 
// 假设已经有一个初始化好的RestHighLevelClient实例client
 
public SearchResponse search(RestHighLevelClient client, String indexName, String fieldName, String queryString) throws IOException {
    SearchRequest searchRequest = new SearchRequest(indexName);
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    searchSourceBuilder.query(QueryBuilders.matchQuery(fieldName, queryString));
    searchSourceBuilder.sort(fieldName, SortOrder.ASC);
    searchSourceBuilder.size(10); // 设置返回结果的最大数量
    searchRequest.source(searchSourceBuilder);
    SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
    return searchResponse;
}
 
// 使用示例
public static void main(String[] args) throws IOException {
    // 初始化Elasticsearch客户端
    RestHighLevelClient client = new RestHighLevelClient(...);
 
    // 调用search方法
    SearchResponse response = search(client, "index_name", "content", "查询字符串");
 
    // 处理搜索结果
    // ...
 
    // 关闭客户端
    client.close();
}

这个代码示例展示了如何使用Elasticsearch Java API进行搜索操作。它定义了一个search方法，该方法接受Elasticsearch客户端、索引名、字段名和查询字符串作为参数，执行匹配查询并按指定字段升序排序，返回前10条结果。在main方法中，我们可以看到如何初始化客户端，调用search方法，以及最后关闭客户端资源的示例。