如何在 NEST、C# 中为 date_histogram 按周编写等效查询

Question

我需要在使用 NEST 时将以下查询转换为 c#。

"aggs": {
          "number_of_weeks": {
              "date_histogram": {
                    "field": "@timestamp",
                    "interval": "week"
                  }
                }
     }

在 Kibana 中，输出是

我写了以下查询，但它给了我零个桶，而在 Kibana 中它 return 许多结果在桶中

var query3 = EsClient.Search<doc>(q => q
                      .Index("SomeIndex")
                      .Size(0)
                      .Aggregations(agg => agg.DateHistogram("group_by_week", e => e.Field(p => p.timestamp) .Interval(DateInterval.Week)
                  )) ;
var resultquery3 = query3.Aggregations.DateHistogram("group_by_week");

在 vs studio 中输出是

Answer 1

问题很可能是

e => e.Field(p => p.timestamp)

不会序列化到 Elasticsearch 中的 "@timestamp" 字段。为此，您需要映射 it with an attribute on the POCO

public class Doc
{
    [Date(Name = "@timestamp")]
    public DateTime timestamp { get; set; }
}

或将其映射到 ConnectionSettings

var pool = new SingleNodeConnectionPool(new Uri("http://localhost:9200"));
var settings = new ConnectionSettings(pool)
    .DefaultMappingFor<Doc>(m => m
        .PropertyName(e => e.timestamp, "@timestamp")
    );

var client = new ElasticClient(settings);

或者，您可以简单地 pass a string to .Field()，它隐式转换

.Field("@timestamp")

如何在 NEST、C# 中为 date_histogram 按周编写等效查询

How to write the equivalent query in NEST,C# for the date_histogram by week

c#

elasticsearch

nest

kibana

asp.net-core