Enabling semantic ranking results in HTTP 500 errors

[kikaragyozov]

2023-06-22T07:25:06.592683253Z fail: Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddleware[1]
2023-06-22T07:25:06.592781202Z       An unhandled exception has occurred while executing the request.
2023-06-22T07:25:06.592813970Z       Azure.RequestFailedException: Highlighting is not supported for 'captions' parameter with 'none'.
2023-06-22T07:25:06.592858873Z       Parameter name: captions
2023-06-22T07:25:06.592863075Z       Status: 400 (Bad Request)
2023-06-22T07:25:06.592867453Z       ErrorCode: InvalidRequestParameter
2023-06-22T07:25:06.592871636Z       
2023-06-22T07:25:06.592875694Z       Content:
2023-06-22T07:25:06.592885155Z       {"error":{"code":"InvalidRequestParameter","message":"Highlighting is not supported for 'captions' parameter with 'none'.\r\nParameter name: captions","details":[{"code":"InvalidCaptionsOption","message":"Highlighting is not supported for 'captions' parameter with 'none'."}]}}
2023-06-22T07:25:06.592889568Z       
2023-06-22T07:25:06.592893559Z       Headers:
2023-06-22T07:25:06.593161545Z       Cache-Control: no-cache,no-store
2023-06-22T07:25:06.593171816Z       Pragma: no-cache
2023-06-22T07:25:06.593176598Z       Server: Microsoft-IIS/10.0
2023-06-22T07:25:06.593181519Z       client-request-id: 0ce20213-3a9e-4b1d-b956-63ebf179a5f8
2023-06-22T07:25:06.593186431Z       x-ms-client-request-id: 0ce20213-3a9e-4b1d-b956-63ebf179a5f8
2023-06-22T07:25:06.593190703Z       request-id: 0ce20213-3a9e-4b1d-b956-63ebf179a5f8
2023-06-22T07:25:06.593209231Z       elapsed-time: 54
2023-06-22T07:25:06.593213742Z       Strict-Transport-Security: REDACTED
2023-06-22T07:25:06.593220076Z       Date: Thu, 22 Jun 2023 07:25:06 GMT
2023-06-22T07:25:06.593224860Z       Content-Length: 277
2023-06-22T07:25:06.593227767Z       Content-Type: application/json; charset=utf-8
2023-06-22T07:25:06.593230589Z       Content-Language: REDACTED
2023-06-22T07:25:06.593233357Z       Expires: -1
2023-06-22T07:25:06.593236139Z       
2023-06-22T07:25:06.593240949Z          at Azure.Search.Documents.SearchClient.SearchInternal[T](SearchOptions options, String operationName, Boolean async, CancellationToken cancellationToken)
2023-06-22T07:25:06.593244524Z          at Azure.Search.Documents.SearchClient.SearchInternal[T](String searchText, SearchOptions options, Boolean async, CancellationToken cancellationToken)
2023-06-22T07:25:06.593247611Z          at Azure.Search.Documents.SearchClient.SearchAsync[T](String searchText, SearchOptions options, CancellationToken cancellationToken)
2023-06-22T07:25:06.593257855Z          at MinimalApi.Extensions.SearchClientExtensions.QueryDocumentsAsync(SearchClient searchClient, String query, RequestOverrides overrides, CancellationToken cancellationToken) in /src/backend/Extensions/SearchClientExtensions.cs:line 37
2023-06-22T07:25:06.593261229Z          at MinimalApi.Services.ReadRetrieveReadChatService.ReplyAsync(ChatTurn[] history, RequestOverrides overrides, CancellationToken cancellationToken) in /src/backend/Services/ReadRetrieveReadChatService.cs:line 91
2023-06-22T07:25:06.593264739Z          at MinimalApi.Extensions.WebApplicationExtensions.OnPostChatAsync(ChatRequest request, ReadRetrieveReadChatService chatService, CancellationToken cancellationToken) in /src/backend/Extensions/WebApplicationExtensions.cs:line 72
2023-06-22T07:25:06.593267766Z          at Microsoft.AspNetCore.Http.RequestDelegateFactory.ExecuteTaskResult[T](Task`1 task, HttpContext httpContext)
2023-06-22T07:25:06.593271490Z          at Microsoft.AspNetCore.Http.RequestDelegateFactory.<>c__DisplayClass90_2.<<HandleRequestBodyAndCompileRequestDelegateForJson>b__2>d.MoveNext()
2023-06-22T07:25:06.593275371Z       --- End of stack trace from previous location ---
2023-06-22T07:25:06.593279535Z          at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
2023-06-22T07:25:06.593283903Z          at Microsoft.AspNetCore.Diagnostics.ExceptionHandlerMiddlewareImpl.<Invoke>g__Awaited|8_0(ExceptionHandlerMiddlewareImpl middleware, HttpContext context, Task task)

Those are my logs.

[kikaragyozov]

After digging around, it seems the Azure Cognitive Search SDK for C# is responsible for this error. Passing QueryCaptionType.None gets serialized down to a value of none|highlight-False which is incorrect as the error explains. Is there really no workaround to this than ditching the whole SDK?