c# - Nest/ElasticSearch按_uid排序

Question

我正在尝试根据查询拉回记录，并使用_uid字段对它们进行排序。在我的情况下，_uid是Type，后跟＃，再加上我设置的id。我的索引中充满了代码文件，并且_uid的示例为myType#MyDocuments/File.txt
所以我正在对_uid升序进行排序。它通常可以正常工作，将类型按顺序排序，但在类型内，仅在最上层目录中正确排序。

所以我会看到类似

Accounting/AP_ABC.asp
Accounting/AR_ABC.asp
Accounting/Account.asp

这是不对的，因为Account应该先于AP和AR。

有没有办法确保可以正确排序？

编辑
从我的索引添加映射

"dotnet":{"properties":{"fileContents":{"type":"string"},"filePath":{"type":"string"},"lastUpdate":{"type":"date","format":"dateOptionalTime"},"type":{"type":"string"}}}

Answer 1

创建一个新的not_analyzed字段，例如sortid，它将保存未分析的id值(Accounting / Account.asp)。 This文章将详细解释您为什么要这样做。

更新:

尝试应用case-insensitive sorting。
稍后，我将通过一个有效的示例来更新我的答案。

UPDATE2

实现您要尝试的操作的最简单方法是创建
具有以下映射的索引:

client.CreateIndex(descriptor => descriptor
    .Index(indexName)
    .AddMapping<Document>(m => m
        .Properties(p => p
            .String(s => s.Name(n => n.Id).Index(FieldIndexOption.NotAnalyzed)))));

class Document
{
    public string Id { get; set; }
}           

用小写id值索引一些文档:

client.Index(new Document {Id = "Accounting/AP_ABC.asp".ToLower()});
client.Index(new Document {Id = "Accounting/AR_ABC.asp".ToLower()});
client.Index(new Document {Id = "Accounting/Account.asp".ToLower()});

然后进行这种排序

var searchResponse = client.Search<Document>(s => s
    .Sort(sort => sort
        .OnField(f => f.Id).Ascending()));

我们将获得

{
   "took": 1,
   "timed_out": false,
   "_shards": {
      "total": 5,
      "successful": 5,
      "failed": 0
   },
   "hits": {
      "total": 3,
      "max_score": null,
      "hits": [
         {
            "_index": "indexname",
            "_type": "document",
            "_id": "accounting/account.asp",
            "_score": null,
            "_source": {
               "id": "accounting/account.asp"
            },
            "sort": [
               "accounting/account.asp"
            ]
         },
         {
            "_index": "indexname",
            "_type": "document",
            "_id": "accounting/ap_abc.asp",
            "_score": null,
            "_source": {
               "id": "accounting/ap_abc.asp"
            },
            "sort": [
               "accounting/ap_abc.asp"
            ]
         },
         {
            "_index": "indexname",
            "_type": "document",
            "_id": "accounting/ar_abc.asp",
            "_score": null,
            "_source": {
               "id": "accounting/ar_abc.asp"
            },
            "sort": [
               "accounting/ar_abc.asp"
            ]
         }
      ]
   }
}

但是，如果您真的很喜欢所提供的ID(例如
您可以使用前面提到的Accounting / AP_ABC.asp)
Case-Insensitive Sorting。

要与NEST一起应用此解决方案，请执行以下操作:

如下创建映射

client.CreateIndex(descriptor => descriptor
    .Index(indexName)
    .Analysis(analysisDescriptor => analysisDescriptor
        .Analyzers(a => a
            .Add("case_insensitive_sort", new CustomAnalyzer
            {
                Tokenizer = "keyword",
                Filter = new List<string> {"lowercase"}
            })))
    .AddMapping<Document>(m => m
        .Properties(p => p
            .String(s => s
                .Name(n => n.Id)
                .Analyzer("case_insensitive_sort")))));

索引文件:

client.Index(new Document {Id = "Accounting/AP_ABC.asp"});
client.Index(new Document {Id = "Accounting/AR_ABC.asp"});
client.Index(new Document {Id = "Accounting/Account.asp"});

对于排序，我们将进行排序，我们将得到以下结果

{
   "took": 1,
   "timed_out": false,
   "_shards": {
      "total": 5,
      "successful": 5,
      "failed": 0
   },
   "hits": {
      "total": 3,
      "max_score": null,
      "hits": [
         {
            "_index": "indexname",
            "_type": "document",
            "_id": "Accounting/Account.asp",
            "_score": null,
            "_source": {
               "id": "Accounting/Account.asp"
            },
            "sort": [
               "accounting/account.asp"
            ]
         },
         {
            "_index": "indexname",
            "_type": "document",
            "_id": "Accounting/AP_ABC.asp",
            "_score": null,
            "_source": {
               "id": "Accounting/AP_ABC.asp"
            },
            "sort": [
               "accounting/ap_abc.asp"
            ]
         },
         {
            "_index": "indexname",
            "_type": "document",
            "_id": "Accounting/AR_ABC.asp",
            "_score": null,
            "_source": {
               "id": "Accounting/AR_ABC.asp"
            },
            "sort": [
               "accounting/ar_abc.asp"
            ]
         }
      ]
   }
}

希望它会有所帮助。