Jest SearchResult 中的热门点击聚合支持

Question

我正在使用以下函数进行聚合查询：

private TermsBuilder getAggregations(String[] outputFields) {

        TermsBuilder topLevelAggr = AggregationBuilders.terms("level1").field("field1").size(0);
        TermsBuilder aggr2 = AggregationBuilders.terms("level2").field("field2").size(0);
        TermsBuilder aggr3 = AggregationBuilders.terms("level3").field("field3").size(0);
        TermsBuilder aggr4 = AggregationBuilders.terms("level4").field("field4").size(0);
        TopHitsBuilder topHitsBuilder = AggregationBuilders.topHits("doc").setSize(1).addSort("fieldValue", SortOrder.DESC);

        aggr4.subAggregation(topHitsBuilder);
        aggr3.subAggregation(aggr4);
        aggr2.subAggregation(aggr3);
        topLevelAggr.subAggregation(aggr2);
        topHitsBuilder.setFetchSource(outputFields, new String[]{});

        return topLevelAggr;
    }

我从这段代码中得到了正确的聚合查询，但在执行查询后我无法提取 top_hits 聚合结果。我在用 io.searchbox.core.SearchResult 类获取查询结果。在这个类中，我找不到任何对 Top_Hits 聚合的支持。

请帮忙。谢谢。

Answer 1

您可以使用顶部的hits aggregation java API。

这是来自 elasticsearch 文档的示例：

// sr is here your SearchResponse object
Terms agg = sr.getAggregations().get("agg");

// For each entry
for (Terms.Bucket entry : agg.getBuckets()) {
    String key = entry.getKey();                    // bucket key
    long docCount = entry.getDocCount();            // Doc count
    logger.info("key [{}], doc_count [{}]", key, docCount);

    // We ask for top_hits for each bucket
    TopHits topHits = entry.getAggregations().get("top");
    for (SearchHit hit : topHits.getHits().getHits()) {
        logger.info(" -> id [{}], _source [{}]", hit.getId(), hit.getSourceAsString());
    }
}