Enum Elastic.Clients.Elasticsearch.IndexManagement.SourceMode mismatch with Elasticsearch response

[matteocalisti]

Elastic.Clients.Elasticsearch version: 8.18.3

Elasticsearch version: 8.18.2

.NET runtime version: 8.0

Operating system version: Win 11

Description of the problem including expected versus actual behavior:
Deserialization of index informations fails if the index has settings.index.mapping.source.mode = STORED because the client expects the enum Elastic.Clients.Elasticsearch.IndexManagement.SourceMode to be lowercase.

Steps to reproduce:
1.
2.
3.

Expected behavior
Should get index informations without exceptions.

Provide ConnectionSettings (if relevant):

Provide DebugInformation (if relevant):

# FailureReason: Unrecoverable/Unexpected BadRequest while attempting GET on http://elastic:elastic@127.0.0.1:32932/test_timeseriesdatapoint-manual-2024-06-23?pretty=true&error_trace=true
 - [1] BadRequest: Node: http://elastic:redacted@127.0.0.1:32932/ Exception: JsonException Took: 00:00:00.5912081
# Audit exception in step 1 BadRequest:
System.Text.Json.JsonException: The JSON value could not be converted to Elastic.Clients.Elasticsearch.IndexManagement.SourceMode. Path: $.source.mode | LineNumber: 2 | BytePositionInLine: 29.
   at Elastic.Clients.Elasticsearch.ThrowHelper.ThrowJsonException(String message) in /_/src/Elastic.Clients.Elasticsearch/_Shared/Core/Exceptions/ThrowHelper.cs:line 16
   at Elastic.Clients.Elasticsearch.IndexManagement.SourceModeConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/_Generated/Types/Enums/Enums.IndexManagement.g.cs:line 746
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
   at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
   at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   at System.Text.Json.JsonSerializer.Read[TValue](Utf8JsonReader& reader, JsonTypeInfo`1 jsonTypeInfo)
   at Elastic.Clients.Elasticsearch.IndexManagement.IndexSettingsConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/_Generated/Types/IndexManagement/IndexSettings.g.cs:line 159
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   at System.Text.Json.JsonSerializer.Read[TValue](Utf8JsonReader& reader, JsonTypeInfo`1 jsonTypeInfo)
   at Elastic.Clients.Elasticsearch.IndexManagement.IndexSettingsConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/_Generated/Types/IndexManagement/IndexSettings.g.cs:line 129
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
   at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonDictionaryConverter`3.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, TDictionary& value)
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   at System.Text.Json.JsonSerializer.Read[TValue](Utf8JsonReader& reader, JsonTypeInfo`1 jsonTypeInfo)
   at Elastic.Clients.Elasticsearch.Serialization.DictionaryResponseConverterFactory.ResolvableDictionaryResponseConverterInner`3.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/_Shared/Serialization/DictionaryResponseConverter.cs:line 74
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.ContinueDeserialize(ReadBufferState& bufferState, JsonReaderState& jsonReaderState, ReadStack& readStack)
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.DeserializeAsync(Stream utf8Json, CancellationToken cancellationToken)
   at Elastic.Transport.Products.Elasticsearch.ElasticsearchResponseBuilder.SetBodyCoreAsync[TResponse](Boolean isAsync, ApiCallDetails details, BoundConfiguration boundConfiguration, Stream responseStream, CancellationToken cancellationToken)
   at Elastic.Transport.DefaultResponseFactory.CreateCoreAsync[TResponse](Boolean isAsync, Endpoint endpoint, BoundConfiguration boundConfiguration, PostData postData, Exception ex, Nullable`1 statusCode, Dictionary`2 headers, Stream responseStream, String contentType, Int64 contentLength, IReadOnlyDictionary`2 threadPoolStats, IReadOnlyDictionary`2 tcpStats, CancellationToken cancellationToken)
   at Elastic.Transport.HttpRequestInvoker.RequestCoreAsync[TResponse](Boolean isAsync, Endpoint endpoint, BoundConfiguration boundConfiguration, PostData postData, CancellationToken cancellationToken)
   at Elastic.Transport.RequestPipeline.CallProductEndpointCoreAsync[TResponse](Boolean isAsync, Endpoint endpoint, BoundConfiguration boundConfiguration, PostData postData, Auditor auditor, CancellationToken cancellationToken)
   at Elastic.Transport.DistributedTransport`1.RequestCoreAsync[TResponse](Boolean isAsync, EndpointPath path, PostData data, Action`1 configureActivity, IRequestConfiguration localConfiguration, CancellationToken cancellationToken)
# Inner Exception: The JSON value could not be converted to Elastic.Clients.Elasticsearch.IndexManagement.SourceMode. Path: $.source.mode | LineNumber: 2 | BytePositionInLine: 29.
System.Text.Json.JsonException: The JSON value could not be converted to Elastic.Clients.Elasticsearch.IndexManagement.SourceMode. Path: $.source.mode | LineNumber: 2 | BytePositionInLine: 29.
   at Elastic.Clients.Elasticsearch.ThrowHelper.ThrowJsonException(String message) in /_/src/Elastic.Clients.Elasticsearch/_Shared/Core/Exceptions/ThrowHelper.cs:line 16
   at Elastic.Clients.Elasticsearch.IndexManagement.SourceModeConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/_Generated/Types/Enums/Enums.IndexManagement.g.cs:line 746
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
   at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
   at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   at System.Text.Json.JsonSerializer.Read[TValue](Utf8JsonReader& reader, JsonTypeInfo`1 jsonTypeInfo)
   at Elastic.Clients.Elasticsearch.IndexManagement.IndexSettingsConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/_Generated/Types/IndexManagement/IndexSettings.g.cs:line 159
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   at System.Text.Json.JsonSerializer.Read[TValue](Utf8JsonReader& reader, JsonTypeInfo`1 jsonTypeInfo)
   at Elastic.Clients.Elasticsearch.IndexManagement.IndexSettingsConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/_Generated/Types/IndexManagement/IndexSettings.g.cs:line 129
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
   at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonDictionaryConverter`3.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, TDictionary& value)
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   at System.Text.Json.JsonSerializer.Read[TValue](Utf8JsonReader& reader, JsonTypeInfo`1 jsonTypeInfo)
   at Elastic.Clients.Elasticsearch.Serialization.DictionaryResponseConverterFactory.ResolvableDictionaryResponseConverterInner`3.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/_Shared/Serialization/DictionaryResponseConverter.cs:line 74
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.ContinueDeserialize(ReadBufferState& bufferState, JsonReaderState& jsonReaderState, ReadStack& readStack)
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.DeserializeAsync(Stream utf8Json, CancellationToken cancellationToken)
   at Elastic.Transport.Products.Elasticsearch.ElasticsearchResponseBuilder.SetBodyCoreAsync[TResponse](Boolean isAsync, ApiCallDetails details, BoundConfiguration boundConfiguration, Stream responseStream, CancellationToken cancellationToken)
   at Elastic.Transport.DefaultResponseFactory.CreateCoreAsync[TResponse](Boolean isAsync, Endpoint endpoint, BoundConfiguration boundConfiguration, PostData postData, Exception ex, Nullable`1 statusCode, Dictionary`2 headers, Stream responseStream, String contentType, Int64 contentLength, IReadOnlyDictionary`2 threadPoolStats, IReadOnlyDictionary`2 tcpStats, CancellationToken cancellationToken)
   at Elastic.Transport.HttpRequestInvoker.RequestCoreAsync[TResponse](Boolean isAsync, Endpoint endpoint, BoundConfiguration boundConfiguration, PostData postData, CancellationToken cancellationToken)
   at Elastic.Transport.RequestPipeline.CallProductEndpointCoreAsync[TResponse](Boolean isAsync, Endpoint endpoint, BoundConfiguration boundConfiguration, PostData postData, Auditor auditor, CancellationToken cancellationToken)
   at Elastic.Transport.DistributedTransport`1.RequestCoreAsync[TResponse](Boolean isAsync, EndpointPath path, PostData data, Action`1 configureActivity, IRequestConfiguration localConfiguration, CancellationToken cancellationToken)
# Exception:
Elastic.Transport.UnexpectedTransportException: The JSON value could not be converted to Elastic.Clients.Elasticsearch.IndexManagement.SourceMode. Path: $.source.mode | LineNumber: 2 | BytePositionInLine: 29.
 ---> System.Text.Json.JsonException: The JSON value could not be converted to Elastic.Clients.Elasticsearch.IndexManagement.SourceMode. Path: $.source.mode | LineNumber: 2 | BytePositionInLine: 29.
   at Elastic.Clients.Elasticsearch.ThrowHelper.ThrowJsonException(String message) in /_/src/Elastic.Clients.Elasticsearch/_Shared/Core/Exceptions/ThrowHelper.cs:line 16
   at Elastic.Clients.Elasticsearch.IndexManagement.SourceModeConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/_Generated/Types/Enums/Enums.IndexManagement.g.cs:line 746
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
   at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
   at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   at System.Text.Json.JsonSerializer.Read[TValue](Utf8JsonReader& reader, JsonTypeInfo`1 jsonTypeInfo)
   at Elastic.Clients.Elasticsearch.IndexManagement.IndexSettingsConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/_Generated/Types/IndexManagement/IndexSettings.g.cs:line 159
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   at System.Text.Json.JsonSerializer.Read[TValue](Utf8JsonReader& reader, JsonTypeInfo`1 jsonTypeInfo)
   at Elastic.Clients.Elasticsearch.IndexManagement.IndexSettingsConverter.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/_Generated/Types/IndexManagement/IndexSettings.g.cs:line 129
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.Metadata.JsonPropertyInfo`1.ReadJsonAndSetMember(Object obj, ReadStack& state, Utf8JsonReader& reader)
   at System.Text.Json.Serialization.Converters.ObjectDefaultConverter`1.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value)
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonDictionaryConverter`3.OnTryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, TDictionary& value)
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   at System.Text.Json.JsonSerializer.Read[TValue](Utf8JsonReader& reader, JsonTypeInfo`1 jsonTypeInfo)
   at Elastic.Clients.Elasticsearch.Serialization.DictionaryResponseConverterFactory.ResolvableDictionaryResponseConverterInner`3.Read(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options) in /_/src/Elastic.Clients.Elasticsearch/_Shared/Serialization/DictionaryResponseConverter.cs:line 74
   at System.Text.Json.Serialization.JsonConverter`1.TryRead(Utf8JsonReader& reader, Type typeToConvert, JsonSerializerOptions options, ReadStack& state, T& value, Boolean& isPopulatedValue)
   at System.Text.Json.Serialization.JsonConverter`1.ReadCore(Utf8JsonReader& reader, JsonSerializerOptions options, ReadStack& state)
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.ContinueDeserialize(ReadBufferState& bufferState, JsonReaderState& jsonReaderState, ReadStack& readStack)
   at System.Text.Json.Serialization.Metadata.JsonTypeInfo`1.DeserializeAsync(Stream utf8Json, CancellationToken cancellationToken)
   at Elastic.Transport.Products.Elasticsearch.ElasticsearchResponseBuilder.SetBodyCoreAsync[TResponse](Boolean isAsync, ApiCallDetails details, BoundConfiguration boundConfiguration, Stream responseStream, CancellationToken cancellationToken)
   at Elastic.Transport.DefaultResponseFactory.CreateCoreAsync[TResponse](Boolean isAsync, Endpoint endpoint, BoundConfiguration boundConfiguration, PostData postData, Exception ex, Nullable`1 statusCode, Dictionary`2 headers, Stream responseStream, String contentType, Int64 contentLength, IReadOnlyDictionary`2 threadPoolStats, IReadOnlyDictionary`2 tcpStats, CancellationToken cancellationToken)
   at Elastic.Transport.HttpRequestInvoker.RequestCoreAsync[TResponse](Boolean isAsync, Endpoint endpoint, BoundConfiguration boundConfiguration, PostData postData, CancellationToken cancellationToken)
   at Elastic.Transport.RequestPipeline.CallProductEndpointCoreAsync[TResponse](Boolean isAsync, Endpoint endpoint, BoundConfiguration boundConfiguration, PostData postData, Auditor auditor, CancellationToken cancellationToken)
   at Elastic.Transport.DistributedTransport`1.RequestCoreAsync[TResponse](Boolean isAsync, EndpointPath path, PostData data, Action`1 configureActivity, IRequestConfiguration localConfiguration, CancellationToken cancellationToken)
   --- End of inner exception stack trace ---
   at Elastic.Transport.DistributedTransport`1.ThrowUnexpectedTransportException[TResponse](Exception killerException, List`1 seenExceptions, Endpoint endpoint, TResponse response, IReadOnlyCollection`1 auditTrail)
   at Elastic.Transport.DistributedTransport`1.RequestCoreAsync[TResponse](Boolean isAsync, EndpointPath path, PostData data, Action`1 configureActivity, IRequestConfiguration localConfiguration, CancellationToken cancellationToken)
   at [...]

[flobernd]

Hi @matteocalisti ,

the index settings are kinda special. Whatever value you store for enums is echoed exactly as is.

The means you could PUT "STORED", "stored" or even "StOrEd".

The 9.0 and 8.19-preview versions correctly handle case insensitive deserialization, but the 8.18 version currently does not.

I'll check how much work it would be to implement this functionality here, but I expect 8.19 stable/GA of the client to be released anyways in the near future.

[matteocalisti]

Thank you for your response @flobernd. I will try the preview version.