elasticsearch nest：使用对象初始值设定项语法创建具有多个聚合的 SearchRequest

Question

我正在寻找如何使用对象初始化器语法来初始化具有多个无嵌套聚合的 SearchRequest 对象。

如果请求通过 lambda 表达式帮助器作为参数提供给 ElasticClient.Search()，它将如下所示：

   var response = Client.Search<person>(s => s.Aggregations(a => 
            a.Terms("bucketAge", t => t.Field("age").Size(50))
             .Terms("bucketCity", t => t.Field("city").Size(50))));

自相矛盾的是我发现我如何用嵌套的 Agg 编写 Agg

 var searchRequest = new SearchRequest<person>
        {
            Size = 0,
            Aggregations =
           new TermsAggregation("bucketAge")
           {
               Field = "age",
               Size = 50,
               Aggregations = new TermsAggregation("bucketcity")
               {
                   Field = "city",
                   Size = 50
             }
           }
        };

但我无法用 2 个 aggs 与类似的东西在同一级别上初始化 SearchRequest：

var searchRequest = new SearchRequest<person>
{
        Size = 0,
        Aggregations =
        {
              new TermsAggregation("bucketAge")
              {
                  Field = "age",
                  Size = 50
              },
              new TermsAggregation("bucketcity")
              {
                  Field = "city",
                  Size = 50
              }
         }
 };

请问这个怎么做？

Answer 1

使用 Object Initializer 语法，您可以将聚合与 && 结合起来

var searchRequest = new SearchRequest<person>
{
    Size = 0,
    Aggregations =
      new TermsAggregation("bucketAge")
      {
          Field = "age",
          Size = 50
      } &&
      new TermsAggregation("bucketcity")
      {
          Field = "city",
          Size = 50
      }

};

var searchResponse = client.Search<person>(searchRequest);

如果您愿意，可以使用聚合字典来使用更长的方法

var aggregations = new Dictionary<string, AggregationContainer>
{
    { "bucketAge", new TermsAggregation("bucketAge")
      {
          Field = "age",
          Size = 50
      }
    },
    { "bucketcity", new TermsAggregation("bucketcity")
      {
          Field = "city",
          Size = 50
      }
    },
};

var searchRequest = new SearchRequest<person>
{
    Size = 0,
    Aggregations = new AggregationDictionary(aggregations)
};

var searchResponse = client.Search<person>(searchRequest);

请注意，Dictionary<string, AggregationContainer> 中的键将是请求中聚合的名称。