Completion type property does not like Contexts described with the fluent/lambda API when nested

[TheFireCookie]

Elastic.Clients.Elasticsearch version:
8.9.1

Elasticsearch version:
8.9.0

.NET runtime version:
7.0.9

Operating system version:
Windows 11

Description of the problem including expected versus actual behavior:
Describing a completion property with some contexts with the fluent api descriptor like this

        .Properties(f => f
          .Completion(completionField, cp => cp
            .Analyzer(Es.Analyzer.ViaSuggest)
            .Contexts(
              c => c
                .Type(Es.Completion.Context.Type)
                .Name(Es.Completion.Context.Fqn)
            )
          )

generate this concrete mapping which is missing the contexts

                "suggests": {
                    "analyzer": "viaSuggestAnalyzer",
                    "max_input_length": 50,
                    "preserve_position_increments": true,
                    "preserve_separators": true,
                    "type": "completion"
                }

But if I describe the contexts in C# like this with a List:

        .Properties(f => f
          .Completion(completionField, cp => cp
            .Analyzer(Es.Analyzer.ViaSuggest)
            .Contexts( new List<SuggestContext> { new() { Name = Es.Completion.Context.Fqn, Type = Es.Completion.Context.Type } } )
          )

then the correct JSON is generated:

                "suggests": {
                    "analyzer": "viaSuggestAnalyzer",
                    "contexts": [{
                            "name": "fqn",
                            "type": "CATEGORY"
                        }
                    ],
                    "max_input_length": 50,
                    "preserve_position_increments": true,
                    "preserve_separators": true,
                    "type": "completion"
                }

[flobernd]

The descriptor looks fine and a minimalistic test provides the correct results:

var client = new ElasticsearchClient();

var desc = new CompletionPropertyDescriptor()
	.Analyzer("viaSuggestAnalyzer")
	.Contexts(x => x
		.Type("typ")
		.Name("test"));

var ms = new MemoryStream();
client.RequestResponseSerializer.Serialize(desc, ms, SerializationFormatting.Indented);
ms.Position = 0;
var sr = new StreamReader(ms);
var s = sr.ReadToEnd();
Console.WriteLine(s);

{
  "contexts": [
    {
      "name": "test",
      "type": "typ"
    }
  ],
  "analyzer": "viaSuggestAnalyzer",
  "type": "completion"
}

I will check this again in a bigger context.

[TheFireCookie]

Indeed I'm in a much deeper context (sub-property in a full index mapping)

[icyice80]

Had the same issue here, my schema is pretty flat, no nested object. had to use the list way, the fluent api way doesnt work at all.

[flobernd]

I was able to reproduce the issue now, but it requires a rather complex change in the code generator. Leaving this open until I have time to work on it 🙂