ElasticSearch NEST DSL 查询跨字段查询

Question

我正在尝试将以下 ElasticSearch DSL 查询转换为 NEST，但似乎有些地方不正确。这是我的 DSL 查询：

{  
  "query": {
    "multi_match": {
            "query": "AJ",
            "type": "cross_fields",            
            "fields": ["name", "shortname", "shortname2", "number"],
            "operator": "and"            
          }
  }
}

我有一个 POCO class。我想获得如下所示的列表结果：

public class SearchDto
    {
        public Guid Id { get; set; }
        public string Number { get; set; }
        public string Name { get; set; }
        public string ShortName2 { get; set; }
        public string ShortName1 { get; set; }
    }

由于是跨字段查询，我创建了这样的字段：

Fields nameField = Infer.Field<SearchDto>(p => p.Name);
var shortName2 = Infer.Field<SearchDto>(p => p.ShortName2);
var shortName1 = Infer.Field<SearchDto>(p => p.ShortName1);
var number = Infer.Field<SearchDto>(p => p.Number);

这是我的 NEST 查询：

var searchRequest = new SearchRequest() {
   Query = new MultiMatchQuery() {
     Fields = nameField
       .And(shortName2)
       .And(shortName1)
       .And(number),
       Query = value,
       Operator = Operator.And,
       Type = TextQueryType.CrossFields
   }
 }

当我为搜索请求获取 Json 字符串时，它仅使用以下内容打印“{}”：

var json = _client.RequestResponseSerializer.SerializeToString(searchRequest);

它还将“{}”作为请求正文发布

我还尝试了以下方法：

var response = _client.Search <List<SearchDto>> (s => s
  .Size(500)
  .Index("mysearchIndex")
  .Query(q => q
    .MultiMatch(m => m
      .Type(TextQueryType.CrossFields)
      .Fields(nameField)
      .Fields(shortName1)
      .Fields(shortName2)
      .Fields(number)
      .Operator(Operator.And)
      .Query(value)
    )
  ));

以上查询仅将“{"size" : 500}" 发送到我的 elasticsearch 端点

有人可以建议我做错了什么 and/or 建议使用 NEST 处理我的查询的更好方法吗？由于某种原因，它甚至没有构建完整的查询。

Answer 1

嵌套查询条件较少。如果确定输入为 null 或空字符串，则请求中将省略查询。

在您的查询中“value”为空或 null ，则生成的查询将为“{}”。

如果您打算搜索空值。然后您需要将单个查询标记为 verbatim

An individual query can be marked as verbatim in order take effect; a verbatim query will be serialized and sent in the request to Elasticsearch, bypassing NEST’s conditionless checks.

例子

var searchRequest = new SearchRequest()
                {
                    Query = new MultiMatchQuery()
                    {
                        Fields = nameField
                       .And(shortName2)
                       .And(shortName1)
                       .And(number),
                        Query = "",
                        Operator = Operator.And,
                        Type = TextQueryType.CrossFields,
                        IsVerbatim=true   ---> note flag
                    }
                };

对应查询

{"query":{"multi_match":{"fields":["name","shortName2","shortName1","number"],"operator":"and","query":"","type":"cross_fields"}}}

ElasticSearch NEST DSL 查询跨字段查询

ElasticSearch NEST DSL Query Cross Fields Query

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ElasticSearch NEST DSL 查询 跨字段查询

ElasticSearch NEST DSL Query Cross Fields Query

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ElasticSearch NEST DSL 查询跨字段查询