从 NEST C# 嵌套聚合中获取 Elasticsearch 结果

Question

我有这个 Elasticsearch NEST 查询：

var res = elastic.Search<SegmentRecord>(s => s.Index(esIndex).Aggregations(a => a.Terms("agg", x => x.Field(o => o.InstrumentName).Aggregations(a1 => a1.Terms("agg2", f => f.Field(y => y.GroupId))))));

如何循环遍历所有 InstrumentName 字段，并为每个字段循环遍历所有 GroupId 字段？

Answer 1

在 Nest 5.4.0 上

foreach (var bucket in res.Aggs.Terms("agg").Buckets)
         {
             foreach (var innerBucket in bucket.Terms("agg2").Buckets)
             {
                 System.Console.WriteLine($"agg:{bucket.Key}, agg2:{innerBucket.Key} - {innerBucket.DocCount}");
             }
         }  

Answer 2

这就是我使用嵌套聚合访问子存储桶的方式。

var yourAgg = result.Aggregations.Terms("YourParentField");
foreach (var child in yourAgg .Buckets)
{
   var aggs = child.Terms("YourChildField").Buckets;
   foreach (var item in aggs)
   {
      perDealerAggItems.Add(new AggregateItem()
        {
              Count = item.DocCount ?? 0,
              Key = item.Key,
              ParentList = field
          });
     }
}