ElasticSearch and Nest：为什么我缺少一个查询的id字段？ [英] ElasticSearch and Nest: Why amd I missing the id field on a query?

问题描述

我创建了一个简单的对象，代表一个会议，它具有时间，位置，名称，主题等元素，并通过Nest在ElasticSearch中进行索引。它有一个Id字段，我留空，以便ES可以生成它们。

I created a simple object that represents a Meeting that has elements such as time, location, name, topic, etc and indexed it in ElasticSearch via Nest. It has an Id field that I leave blank so that ES can generate them.

稍后我检索到所有缺少GEO坐标的文档，以便我可以更新它们。我所有返回的元素对于id字段仍然为空，当我将其更新回ES时，它会为它们创建新的文档。

Later on I retrieved all the documents that are missing GEO coordinates so that I may update them. All my returned elements still have null for the id field and when I update them back to ES it creates new documents for them.

我在这里缺少什么，使我的所有ID都为空？

What am I missing here that makes all my id's null?

谢谢

这是会议类（id支架是多余的，但是我也尝试过）

Here is the Meeting class (the id prop is redundant but I tried it anyway)

[ElasticType(IdProperty = "Id")]
    public class Meeting
    {
        public string Id { get; set; }
        public string Code { get; set; }
        public string Day { get; set; }
        public string Town { get; set; }
        public string Name { get; set; }
        public string Location { get; set; }
        public string OriginalTime { get; set; }
        public string OriginalTimeCleaned { get; set; }
        public string Handicap { get; set; }
        public string FormattedAddress { get; set; }
        public Coordinates Coordinates { get; set; }
        public List<MeetingTime> Times = new List<MeetingTime>();
        public bool IsProcessed { get; set; }    
    }

这是我如何检索会议

 public static List<Meeting> GetAddressesWithMissingCoordinates()
        {

            var result = Client.Search<Meeting>(s => s
                .Index("meetings")
                .AllTypes()
                .Query(p => p.Filtered(f => f.Filter(x => x.Missing(c => c.Coordinates)))));


            return result.Documents.ToList();
        }

这是我的更新语句，Id为null

Here is my update statement, Id is null

 public static void UpdateMeetingCoordinates(Meeting meeting, Coordinates coordinates)
        {
            meeting.Coordinates = coordinates;

            var response = Client.Index(meeting, u => u
                .Index("meetings")
                .Type("meeting")
                //.Id(meeting.Id.ToString())
                .Refresh()
                );

            Console.WriteLine(response);
        }

我也尝试过部分更新，没有运气。

I've tried partial updates as well with no luck.

推荐答案

Elasticsearch设置一个_ id元数据参数（为它选择一个价值，如果你没有指定一个），但它没有在您的文档来源设置该值

Elasticsearch sets an "_id" meta-data parameter (for which it chooses a value if you don't specify one), but it doesn't set that value in your document source.

为了说明，如果我创建一个平凡的索引：

To illustrate, if I create a trivial index:

PUT /test_index

然后给它一些文件，而不指定_ id：

then give it a couple of documents, without specifying "_id":

POST /test_index/doc/_bulk
{"index":{}}
{"id":null,"name":"doc1"}
{"index":{}}
{"id":null,"name":"doc2"}

然后搜索：

POST /test_index/_search

这是我回来的：

{
   "took": 2,
   "timed_out": false,
   "_shards": {
      "total": 5,
      "successful": 5,
      "failed": 0
   },
   "hits": {
      "total": 2,
      "max_score": 1,
      "hits": [
         {
            "_index": "test_index",
            "_type": "doc",
            "_id": "AVEmuVlmj_RE0PsHCpza",
            "_score": 1,
            "_source": {
               "id": null,
               "name": "doc2"
            }
         },
         {
            "_index": "test_index",
            "_type": "doc",
            "_id": "AVEmuVlmj_RE0PsHCpzZ",
            "_score": 1,
            "_source": {
               "id": null,
               "name": "doc1"
            }
         }
      ]
   }
}

请注意，_ id元数据参数是为两个文档设置的，但是我传递的id字段没有改变。这是因为，就弹性搜索而言，id只是另一个文档字段。

Notice that the "_id" meta-data parameter was set for both documents, but the "id" field I passed is unchanged. That's because, as far as Elasticsearch is concerned, "id" is just another document field.

（这里是我使用的代码： http://sense.qbox.io/gist/777dafae88311c4105453482050c64d69ccd09db ）

(here is the code I used: http://sense.qbox.io/gist/777dafae88311c4105453482050c64d69ccd09db)

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