RestAPI实现聚合(黑马教程)

@Test
    void testAggredation() throws IOException {
        //1. 准备Request
        SearchRequest request = new SearchRequest("hotel");
        //2. 准备DSL
        //2.1 设置size
        request.source().size(0);
        //2.2 聚合
        request.source().aggregation(AggregationBuilders
                .terms("brandAgg")
                .field("brand")
                .size(10)
        );

        //3. 发出请求
        SearchResponse response = client.search(request,RequestOptions.DEFAULT);
        //4. 解析结果
        Aggregations aggregations = response.getAggregations();
        //4.1 根据聚合名称获取聚合结果
        Terms brandTerms = aggregations.get("brandAgg");
        //4.2 获取buckets
        List<? extends Terms.Bucket> buckets = brandTerms.getBuckets();
        //4.3 遍历
        for(Terms.Bucket bucket : buckets){
            //4.4 获取key
            String key = bucket.getKeyAsString();

            System.out.println(key);
        }


    }

ps: