利用Elasticsearch提升Java应用的搜索能力

import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.search.SearchHit;
 
// 假设已经创建并配置好RestHighLevelClient实例client
RestHighLevelClient client;
 
public void searchWithElasticsearch(String indexName, String fieldName, String searchText) throws IOException {
    // 构建搜索请求
    SearchRequest searchRequest = new SearchRequest(indexName);
 
    // 构建搜索源构建器
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    searchSourceBuilder.query(QueryBuilders.matchQuery(fieldName, searchText)); // 使用match查询
 
    searchRequest.source(searchSourceBuilder);
 
    // 执行搜索
    SearchResponse searchResponse = client.search(searchRequest, RequestOptions.DEFAULT);
 
    // 处理搜索结果
    for (SearchHit hit : searchResponse.getHits().getHits()) {
        System.out.println(hit.getSourceAsString());
    }
}

这段代码展示了如何使用Elasticsearch Java API在指定索引中搜索特定字段包含特定文本的文档。代码中创建了一个搜索请求，并设置了搜索源构建器，其中定义了match查询用于搜索文档。然后执行搜索并打印返回结果的文档源。