使用 C# Nest API 获取嵌套 json 数据未检索数据

Question

我有以下 json 来自 elasticsearch：

{
  "_index": "data-2016-01-14",
  "_type": "type-data",
  "_id": "AVJBBNG-TE8FYIA1rf1p",
  "_score": 1,
  "_source": {
    "@message": {
      "timestamp": 1452789770326461200,
      "eventID": 1452789770326461200,
      "eventName": "New",
      "Price": "38.34",
      "Qty": 100,
      "statistic_LatencyValue_ns": 1142470,
      "statistic_LatencyViolation": false,
      "statistic_LossViolation": false
    },
    "@timestamp": "2016-01-14T16:42:50.326Z",
    "@fields": {
      "timestamp": "1452789770326"
    }
  },
  "fields": {
    "@timestamp": [
      1452789770326
    ]
  }
}

我正在使用 Nest 尝试获取我创建 class 并标记属性:

的 eventName 数据

public class ElasticTest
{
    [ElasticProperty(Type = FieldType.Nested)] 
    public string eventName { get; set; }
}

但是下面的查询返回了 0 个结果，我做错了什么？

var result = client.Search<CorvilTest>(s => s
                    .From(0)
                    .Size(10000)
                    .Query(x => x
                    .Term(e => e.eventName,"New"))
                    );
                var r = result.Documents;

映射定义：

{
   "data-2016-01-14": {
      "mappings": {
         "type-data": {
            "properties": {
               "@fields": {
                  "properties": {
                     "timestamp": {
                        "type": "string"
                     }
                  }
               },
               "@message": {
                  "properties": {
                     "OrderQty": {
                        "type": "long"
                     },
                     "Price": {
                        "type": "string"
                     },
                     "eventID": {
                        "type": "long"
                     },
                     "eventName": {
                        "type": "string"
                     },
                     "statistic_LatencyValue_ns": {
                        "type": "long"
                     },
                     "statistic_LatencyViolation": {
                        "type": "boolean"
                     },
                     "statistic_LossViolation": {
                        "type": "boolean"
                     },
                     "timestamp": {
                        "type": "long"
                     }
                  }
               },
               "@timestamp": {
                  "type": "date",
                  "format": "dateOptionalTime"
               }
            }
         }
      }
   }
}

Answer 1

我看到字段 @message.eventName 正在使用标准分析器，这意味着它的值为 lower-cased 并在索引之前在单词边界处拆分。因此值 "new" 被索引而不是 "New"。阅读更多相关信息 here. You need to be mindful about this fact when using a Term Query。另一件事是字段 eventName 不是 nested 类型。所以下面的代码应该适合你。

var result = client.Search<CorvilTest>(s => s
    .From(0)
    .Size(10000)
    .Query(x => x
        .Term(e => e.Message.EventName, "new"))); // Notice I've used "new" and not "New"

var r = result.Documents;

为使上述代码正常工作，CorvilTest class 的定义应如下所示：

public class CorvilTest
{
    [ElasticProperty(Name = "@message")]
    public Message Message { get; set; }

    /* Other properties if any */
}

public class Message
{
    [ElasticProperty(Name = "eventName")]
    public string EventName { get; set; }
}

使用 C# Nest API 获取嵌套 json 数据未检索数据

Using C# Nest API to get nested json data is not retrieving data

c#

json

nest

elasticsearch-plugin