How to search in attachment content?

Elastic Stack Elasticsearch
1

I ingest pdf files into elastic.
I can successful search in it using Kibana Console.
But at my C# code I don't get any result.
I'm quit sure the problem is syntax of my code.
But I tried many things and still I don't get the result.
I always tried using the fields "Content" and "Attachment" to search in.
How do I search a attachment using C#?
Is there a documentation about the elastic - C# - syntax?

my successful request:

GET /attachments/_search 
{
  "query": {
    "match": {
      "attachment.content": "Preisangebot"
    }
  }
}

My unsuccessful C# request:

            var searchResponse = client.Search<Document>(s => s
               .Query(q => q
                    .Match(m => m
                    .Field(f => f.Attachment.Content)
                    .Query("Preisangebot")
                    )
               )
            );

also unsuccessful:

            var searchRequest = new SearchRequest<Document>(Nest.Indices.All)
            {
                Query = new MatchQuery
                {
                    Field = Infer.Field<Document>(f => f.Content),
                    Query = "Preisangebot"
                }
            };
            var searchResponse2 = client.Search<Document>(searchRequest);

also unsuccessful:

            var searchResponse3 = client.Search<Document>(s => s
                .Index("attachments")
                .Query(q => q
                .Bool(b => b
                .Must(m => m
                .Match(mt => mt.Field(f => f.Content).Query("Preisangebot"))
            ))));

ingesting pdf files:

                        var base64File = Convert.ToBase64String(File.ReadAllBytes(path));
                        var indexResponse = client.Index(new Document
                        {
                            Id = i,
                            Path = path,
                            Content = base64File
                        }, i => i
                          .Pipeline("attachments")
                          .Refresh(Refresh.WaitFor)
                        );

Document class:

    public class Document
    {
        public int Id { get; set; }
        public string Path { get; set; }
        public string Content { get; set; }
        public Attachment Attachment { get; set; }
    }
2

I'm still very much interested in any ideas or answers.

3

Für alle die sich für das Thema interessieren, hier habe ich meine derzeitige Lösung beschrieben.
Bin aber offen für weitere Lösungen mit ElasticClient.

4

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