ElasticSearch NEST 术语查询 returns 无结果

Question

这是我的架构

[ElasticType(Name = "importFile")]
public class ImportFile : DocumentMapping
{
    [ElasticProperty(Store = false, Index = FieldIndexOption.NotAnalyzed)]
    public string FileName { get; set; }

    [ElasticProperty(Store = false, Index = FieldIndexOption.NotAnalyzed)]
    public string GroupId { get; set; }

    [ElasticProperty(Store = false, Index = FieldIndexOption.Analyzed)]
    public string FilePath { get; set; }
}

我做了一个这样的 NEST 查询：

    var res = ElasticClient.Search<ImportFile>(s => s
        .Index(ElasticIndexName)
        .Filter(f =>
            f.Term(t => t.FileName, "Group-1.uhh"))).Documents.ToArray();

和returns个零元素！

如果我查看数据库内部（使用邮递员），我可以看到我的文件：

{
  "took": 5,
  "timed_out": false,
  "_shards": {
    "total": 2,
    "successful": 2,
    "failed": 0
  },
  "hits": {
    "total": 2,
    "max_score": 14.069489,
    "hits": [
      {
        "_index": "reviewer-bdd-test-index",
        "_type": "importFile",
        "_id": "AU9kUka2hr5Jg98UXOae",
        "_score": 14.069489,
        "_source": {
          "fileName": "Group-1.uhh",
          "groupId": "0ae1206d0644eabd82ae490e612732df5da2cd141fdee70dc64207f86c96094f",
          "filePath": ""
        }
      },
      {
        "_index": "reviewer-bdd-test-index",
        "_type": "importFile",
        "_id": "AU9kZO25hr5Jg98UXRnk",
        "_score": 14.069489,
        "_source": {
          "fileName": "group-1.uhh",
          "groupId": "0ae1206d0644eabd82ae490e612732df5da2cd141fdee70dc64207f86c96094f",
          "filePath": ""
        }
      }
    ]
  }
}

Answer 1

听起来您可能没有在索引您的文档之前明确地将类型的映射放入索引 中，因此 Elasticsearch 已根据字段的默认映射推断出映射在它看到的文件中。例如，给定以下类型

[ElasticType(Name = "importFile")] public class ImportFile { [ElasticProperty(Store = false, Index = FieldIndexOption.NotAnalyzed)] public string FileName { get; set; } [ElasticProperty(Store = false, Index = FieldIndexOption.NotAnalyzed)] public string GroupId { get; set; } [ElasticProperty(Store = true, Index = FieldIndexOption.Analyzed)] public string FilePath { get; set; } }

如果我们索引一些文档如下

void Main() { var settings = new ConnectionSettings(new Uri("http://localhost:9200")); var client = new ElasticClient(settings); client.Index<ImportFile>( new ImportFile{ FileName = "Group-1.uhh", FilePath = "", GroupId = "0ae1206d0644eabd82ae490e612732df" + "5da2cd141fdee70dc64207f86c96094" }, index => index .Index("reviewer-bdd-test-index") .Type("importFile") .Refresh()); client.Index<ImportFile>( new ImportFile { FileName = "group-1.uhh", FilePath = "", GroupId = "0ae1206d0644eabd82ae490e612732df" + "5da2cd141fdee70dc64207f86c96094" }, index => index .Index("reviewer-bdd-test-index") .Type("importFile") .Refresh()); var results = client.Search<ImportFile>(s => s .Index("reviewer-bdd-test-index") .Type("importFile") .Query(q => q .Filtered(fq => fq .Filter(f => f .Term(p => p.FileName, "Group-1.uhh") ) ) ) ); Console.WriteLine(string.Format("{0} {1}", results.RequestInformation.RequestMethod, results.RequestInformation.RequestUrl)); Console.WriteLine(Encoding.UTF8.GetString(results.RequestInformation.Request)); Console.WriteLine("Matching document count: {0}", results.Documents.Count()); }

控制台输出如下

POST http://localhost:9200/reviewer-bdd-test-index/importFile/_search { "query": { "filtered": { "filter": { "term": { "fileName": "Group-1.uhh" } } } } } Matching document count: 0

我们没有找到匹配的文档。使用
检查 Elasticsearch 中的映射
curl -XGET "http://localhost:9200/reviewer-bdd-test-index/_mapping"

我们看到类型 importFile 的映射是

{ "reviewer-bdd-test-index": { "mappings": { "importFile": { "properties": { "fileName": { "type": "string" }, "groupId": { "type": "string" } } } } } }

这不是我们所期望的； fileName 和 groupId 也应该有 "index": "not_analyzed" 而 filePath 甚至不在映射中。这两者都是因为 Elasticsearch 已经根据传递给它的文档推断出映射 - fileName 和 groupId 已经被映射为字符串类型，并且将使用标准分析器进行分析，而 我相信 filePath 没有被映射，因为两个看到的文档都有一个空字符串值的字段，所以 standard analyzer 应用于该字段不会为倒排索引生成任何标记，因此该字段不包含在映射中。

因此，为了确保事情按预期工作，我们需要在索引任何文档之前向索引添加映射

void Main() { var settings = new ConnectionSettings(new Uri("http://localhost:9200")); var client = new ElasticClient(settings); // Add the mapping for ImportFile to the index client.CreateIndex(indexSelector => indexSelector .Index("reviewer-bdd-test-index") .AddMapping<ImportFile>(mapping => mapping .MapFromAttributes() ) ); // ... Same as above after this point }

结果是

POST http://localhost:9200/reviewer-bdd-test-index/importFile/_search { "query": { "filtered": { "filter": { "term": { "fileName": "Group-1.uhh" } } } } } Matching document count: 1

成功！我们有一个匹配的文档。检查 Elasticsearch 中的映射会产生我们期望的结果

{ "reviewer-bdd-test-index": { "mappings": { "importFile": { "properties": { "fileName": { "type": "string", "index": "not_analyzed" }, "filePath": { "type": "string", "store": true }, "groupId": { "type": "string", "index": "not_analyzed" } } } } } }

此外，属性映射可以替换为流式映射

var indexResult = client.CreateIndex(indexDescriptor => indexDescriptor .Index("reviewer-bdd-test-index") .AddMapping<ImportFile>(mapping => mapping .Type("importFile") .MapFromAttributes() .Properties(properties => properties .String(s => s .Name(file => file.FileName) .Store(false) .Index(FieldIndexOption.NotAnalyzed)) .String(s => s .Name(file => file.GroupId) .Store(false) .Index(FieldIndexOption.NotAnalyzed)) .String(s => s .Name(file => file.FilePath) .Store(true)) ) ) );

此时无论是属性映射还是流畅映射都可以，但是有些事情只能通过流畅映射才能实现，例如multi_fields.

ElasticSearch NEST 术语查询 returns 无结果

ElasticSearch NEST term query returns no results

c#

database

elasticsearch

nest