ElasticSearch High Level REST API【4】多搜索

最新推荐文章于 2022-05-24 15:40:37 发布

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最新推荐文章于 2022-05-24 15:40:37 发布

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文章标签：大数据

原文链接：http://www.cnblogs.com/chentop/p/10296526.html

本文介绍如何使用Elasticsearch的Multi-Search功能来并行执行多个搜索请求，通过在一个HTTP请求中同时处理多个查询，显著提升查询效率。演示了如何通过mget方法设置多个搜索条件，包括匹配姓名和职位的查询。

1、Multi-Search多搜索请求

Multi-Search可同时添加多个search搜索请求，并行地在一个http请求中执行多个搜索请求，相较多次单请求查询可提升查询效率。ES客户掉通过mget方法实现多请求搜索：

public void multiSearch(){
        RestHighLevelClient client = elasticClient.getRestHighLevelClient();
        MultiSearchRequest request = new MultiSearchRequest();
        SearchRequest firstSearchRequest = new SearchRequest();
        SearchSourceBuilder firstBuilder = new SearchSourceBuilder();
        firstBuilder.query(matchQuery("name","潇潇"));
        firstSearchRequest.source(firstBuilder);
        request.add(firstSearchRequest);
        SearchRequest secondRequest = new SearchRequest();
        SearchSourceBuilder secondBuild = new SearchSourceBuilder();
        secondBuild.query(matchQuery("position","建筑师"));
        secondRequest.source(secondBuild);
        request.add(secondRequest);
        try {
            MultiSearchResponse multiResponse = client.msearch(request, RequestOptions.DEFAULT);
            MultiSearchResponse.Item firstItem  = multiResponse.getResponses()[0];
            if (firstItem.getFailure() != null) {
                System.out.println("第一个请求失败！");
            }
            SearchResponse firstResponse = firstItem.getResponse();
            for (SearchHit documentFields : firstResponse.getHits().getHits()) {
                System.out.println("第一个查询请求返回："+documentFields.getSourceAsString());
            }
            MultiSearchResponse.Item seconditem = multiResponse.getResponses()[1];
            if (seconditem.getFailure() != null) {
                System.out.println("第二个请求失败！");
            }
            SearchResponse secondResponse = seconditem.getResponse();
            for (SearchHit documentFields : secondResponse.getHits().getHits()) {
                System.out.println("第二的查询请求返回：" + documentFields.getSourceAsString());
            }
            client.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }