c# - 如何实现 Elasticsearch Suggester？

Question

我正在尝试实现一个使用 Elastic Search 中的建议功能的示例代码。

索引文档由平面 POCO 组成

public class CandidateDocument
{
    public Guid Id { get; set; }
    public string Name { get; set; }
    public string FirstName { get; set; }
    public DateTime BirthDate { get; set; }
    public CompletionField Suggest { get; set; }
}

映射如下

var client = new ElasticClient(settings);

client.Indices.Create("candidates", c =>
                                           c.Map<CandidateDocument>(m =>
                                                            m.Properties(ps => ps.Text(s => s.Name(n => n.Name)
                                                                                             .Store(false)
                                                                                             .Fields(f => f.Keyword(k => k.Name("nameRaw"))))
                                                                                 .Text(s => s.Name(n => n.FirstName)
                                                                                             .Store(false)
                                                                                             .Fields(f => f.Keyword(k => k.Name("firstNameRaw"))
                                                                                 
                                                                                 .Date(s => s.Name(n => n.BirthDate).Format("ddMMyyyy"))
                                                                                 .Keyword(s => s.Name(n => n.Id))))
                                                                               
                                                                                 .Completion(c => c.Name(n => n.Suggest)))));

索引文档如下所示：

 var candidateDocument = new CandidateDocument
        {
            Id = Guid.NewGuid(),
            Name = "Lennon",
            FirstName = "John",
            BirthDate = DateTime.Now,
            Suggest = new CompletionField
            {
                Input = new[] { "Lennon" },
            }
        };

    var indexResponse = await this.elasticClient.IndexAsync(candidateDocument, i => i.Index("candidates"));

我的查询是：

var searchResponse = await this.elasticClient.SearchAsync<CandidateDocument>(s => s.Index("candidates").Suggest(su => su
                                                                                                       .Completion("suggestions", c => c
                                                                                                                                        .Field(f => f.Suggest)
                                                                                                                                        .Prefix(query)
                                                                                                                                        .Fuzzy(f => f.Fuzziness(Fuzziness.Auto))
                                                                                                                                        .Size(5))));

我面临以下问题：

Elasticsearch.Net.ElasticsearchClientException：请求执行失败。呼叫：状态代码 400 来自：POST /candidates/_search?typed_keys=true。ServerError：类型：search_phase_execution_exception 原因：“所有分片失败” CausedBy：“类型：非法参数异常原因：“未找到字段 [建议] 的映射” CausedBy：“类型：非法参数异常原因：“未找到字段 [建议] 的映射”

使用 kibana 查看我的索引映射：

      "suggest": {
      "properties": {
        "input": {
          "type": "text",
          "fields": {
            "keyword": {
              "type": "keyword",
              "ignore_above": 256
            }
          }
        }
      }
    }

顺便说一句，我在 .NET Core 3.1 中使用最新版本的 Nest (7.9.0)

我会很感激你的帮助。

标签： c#asp.net-coreelasticsearchnest

Answer 1

有同样的问题，通过显式映射解决：

_elasticClient.Indices.Create("candidates", c => c
 .Map<CandidateDocument>(m => m
     .Properties(ps => ps
         .Completion(s => s
             .Name(n => n.Suggest)))));

public class CandidateDocument
{        
    public Guid? Id { get; set; }
    public CompletionField Suggest { get; set; }
}