GetIndexTemplate causes deserialization error on the response at min_gram

[h-h-]

Elastic.Clients.Elasticsearch version: 8.0.5

Elasticsearch version: 8.2.3

.NET runtime version: .NET Framework 4.6.2

Operating system version: Windows 10 22H2

Description of the problem including expected versus actual behavior:
When requesting an index template via the GetIndexTemplate methods, an exception is thrown when deserializing the response.

Steps to reproduce:
Create the following or similar index template containing min_gram:

{
  "template": {
    "settings": {
      "index": {
        "analysis": {
          "analyzer": {
            "fta": {
              "filter": [
                "lowercase"
              ],
              "type": "custom",
              "tokenizer": "ftt"
            }
          },
          "tokenizer": {
            "ftt": {
              "token_chars": [
                "letter",
                "digit",
                "punctuation",
                "symbol"
              ],
              "min_gram": "3",
              "type": "ngram",
              "max_gram": "3"
            }
          }
        },
        "routing": {
          "allocation": {
            "include": {
              "_tier_preference": "data_content"
            }
          }
        },
        "default_pipeline": "abcd-10_elasticsearchclient.tests.mysearch.clientv8.testsclientv8setup_pipeline"
      }
    },
    "aliases": {},
    "mappings": {}
  }
}

Execute the following code:

var getIndexTemplateResponse = await _elasticClient.Indices.GetIndexTemplateAsync(d => d.Name("mytemplatename"));

Expected behavior
Correct deserialization of the response.

Actual behavior
An expectation is thrown:

Elastic.Transport.UnexpectedTransportException: The JSON value could not be converted to System.Int32. Path: $.min_gram | LineNumber: 7 | BytePositionInLine: 36. ---> System.Text.Json.JsonException: The JSON value could not be converted to System.Int32. Path: $.min_gram | LineNumber: 7 | BytePositionInLine: 36. ---> System.InvalidOperationException: Cannot get the value of a token type 'String' as a number.
   bei System.Text.Json.Utf8JsonReader.TryGetInt32(Int32& value)
   bei System.Text.Json.Utf8JsonReader.GetInt32()
   bei System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
   bei System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   --- Ende der internen Ausnahmestapelüberwachung ---
   bei System.Text.Json.ThrowHelper.ReThrowWithPath(ReadStack& state, Utf8JsonReader& reader, Exception ex)
   bei System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   bei System.Text.Json.JsonSerializer.Read[TValue](Utf8JsonReader& reader, JsonTypeInfo jsonTypeInfo)
   bei Elastic.Clients.Elasticsearch.Analysis.TokenizerInterfaceConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/_Generated/Types/Analysis/Tokenizers.g.cs:Zeile 119.
   bei System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.JsonDictionaryConverter`3.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, TDictionary& value)
   bei System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   bei System.Text.Json.JsonSerializer.Read[TValue](Utf8JsonReader& reader, JsonTypeInfo jsonTypeInfo)
   bei Elastic.Clients.Elasticsearch.Serialization.IsADictionaryConverterFactory.IsADictionaryConverterInner`3.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/Serialization/IsADictionaryConverterFactory.cs:Zeile 43.
   bei System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
   bei System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   bei System.Text.Json.JsonSerializer.Read[TValue](Utf8JsonReader& reader, JsonTypeInfo jsonTypeInfo)
   bei Elastic.Clients.Elasticsearch.IndexManagement.IndexSettingsConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/_Generated/Types/IndexManagement/IndexSettings.g.cs:Zeile 43.
   bei System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   bei System.Text.Json.JsonSerializer.Read[TValue](Utf8JsonReader& reader, JsonTypeInfo jsonTypeInfo)
   bei Elastic.Clients.Elasticsearch.IndexManagement.IndexSettingsConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/_Generated/Types/IndexManagement/IndexSettings.g.cs:Zeile 127.
   bei System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
   bei System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
   bei System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
   bei System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.JsonCollectionConverter`2.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, TCollection& value)
   bei System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
   bei System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   bei System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   bei System.Text.Json.JsonSerializer.ReadCore[TValue](JsonReaderState& readerState, Boolean isFinalBlock, ReadOnlySpan`1 buffer, JsonSerializerOptions options, ReadStack& state, JsonConverter converterBase)
   bei System.Text.Json.JsonSerializer.ContinueDeserialize[TValue](ReadBufferState& bufferState, JsonReaderState& jsonReaderState, ReadStack& readStack, JsonConverter converter, JsonSerializerOptions options)
   bei System.Text.Json.JsonSerializer.<ReadAllAsync>d__65`1.MoveNext()
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   bei System.Threading.Tasks.ValueTask`1.get_Result()
   bei Elastic.Transport.DefaultResponseBuilder`1.<SetBodyAsync>d__12`1.MoveNext() in /home/runner/work/elastic-transport-net/elastic-transport-net/src/Elastic.Transport/Components/Pipeline/DefaultResponseBuilder.cs:Zeile 285.
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   bei Elastic.Transport.DefaultResponseBuilder`1.<ToResponseAsync>d__5`1.MoveNext()
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   bei Elastic.Transport.HttpWebRequestTransportClient.<RequestAsync>d__7`1.MoveNext() in /home/runner/work/elastic-transport-net/elastic-transport-net/src/Elastic.Transport/Components/TransportClient/HttpWebRequestTransportClient.cs:Zeile 178.
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   bei Elastic.Transport.DefaultRequestPipeline`1.<CallProductEndpointAsync>d__55`1.MoveNext() in /home/runner/work/elastic-transport-net/elastic-transport-net/src/Elastic.Transport/Components/Pipeline/DefaultRequestPipeline.cs:Zeile 271.
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   bei Elastic.Transport.DefaultHttpTransport`1.<RequestAsync>d__17`1.MoveNext() in /home/runner/work/elastic-transport-net/elastic-transport-net/src/Elastic.Transport/DefaultHttpTransport.cs:Zeile 253.
   --- Ende der internen Ausnahmestapelüberwachung ---
   bei Elastic.Transport.DefaultHttpTransport`1.ThrowUnexpectedTransportException[TResponse](Exception killerException, List`1 seenExceptions, RequestData requestData, TResponse response, RequestPipeline pipeline) in /home/runner/work/elastic-transport-net/elastic-transport-net/src/Elastic.Transport/DefaultHttpTransport.cs:Zeile 328.
   bei Elastic.Transport.DefaultHttpTransport`1.<RequestAsync>d__17`1.MoveNext() in /home/runner/work/elastic-transport-net/elastic-transport-net/src/Elastic.Transport/DefaultHttpTransport.cs:Zeile 266.
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   bei Elastic.Clients.Elasticsearch.ElasticsearchClient.<>c__DisplayClass32_0`3.<<DoRequestAsync>g__SendRequest|0>d.MoveNext()
--- Ende der Stapelüberwachung vom vorhergehenden Ort, an dem die Ausnahme ausgelöst wurde ---
   bei System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   bei System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   bei System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()

[stevejgordon]

Thanks for raising this, @h-h-. In fact, I just identified a related issue. I have a fix planned to configure the serializer to accept numbers as strings that I hope resolves this specific issue too. I intend to work on that and include the fix in the next patch release.