使用C＃巢API来获取嵌套的JSON数据不会检索数据

Question

我有以下的JSON通过elasticsearch未来：

{ 
    "_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 
    ] 
    } 
} 

我使用谷，试图获得eventName的数据我创建的类和标记属性：

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

但下面的查询返回0的结果，我究竟做错了什么？

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使用标准分析器，这意味着它的值是小写和索引之前在字边界分割。因此，“新”值被索引，而不是“新”。详细了解它here。使用Term Query时需要注意这一事实。另一件事是该字段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; 

上面的代码工作CorvilTest类的定义应该是象下面这样：

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; } 
}