ElasticSearch NEST 在 MVC 应用程序的序列化请求中添加 $type

Question

我正在尝试使用 MVC 应用程序中的 NEST，但是我的请求序列化不正确：

iisexpress.exe Error: 0 : NEST POST http://localhost:9200/_search (00:00:00.8188240):
StatusCode: 400, 
    Method: POST, 
    Url: http://localhost:9200/_search, 
    Request: {
  "$type": "Nest.SearchDescriptor`1[[System.Object, mscorlib]], Nest",
  "aggs": {
    "Period": {
      "$type": "Nest.AggregationDescriptor`1[[System.Object, mscorlib]], Nest",
      "date_histogram": {
        "$type": "Nest.DateHistogramAggregationDescriptor`1[[System.Object, mscorlib]], Nest",
        "field": "Timestamp",
        "interval": "day",
        "format": "yyyy-MM-dd"
      }
    }
  }
}

查询很简单：

        var cs2 = new ConnectionSettings(new Uri("http://localhost:9200")).EnableTrace();
        var client = new ElasticClient(cs2);

        var res3 = client.Search<object>(q =>q.Aggregations(agg =>
                agg.DateHistogram("DayAgg", t => t.Field("Timestamp").Interval("day"))));

完全相同的代码在控制台应用程序中运行良好，所以我认为这可能与序列化有关，因为在不好的情况下添加了“$type”属性。

Answer 1

发现相关问题：Serialization error with Elasticsearch NEST/C#

根本原因是以下设置：

config.Formatters.JsonFormatter.SerializerSettings.TypeNameHandling = TypeNameHandling.Objects;

现在还有一个支持设置的新api：SetJsonSerializerSettingsModifier

        var cs2 = new ConnectionSettings(new Uri("http://localhost:9200"))
            .SetJsonSerializerSettingsModifier(settings => settings.TypeNameHandling = TypeNameHandling.None)
            .EnableTrace();