Language Understanding (LUIS) V3 doesn't support Bing Spell Check API

Version

“botbuilder”: “~4.15.0”, “botbuilder-ai”: “~4.15.0”,

Describe the bug

I try to improve LUIS intents prediction accuracy. Because there is an issue when missing one letter leads LUIS to a wrong intent. I use the tutorial, but still I don’t get the expected value “alteredQuery” in the JSON returned form LUIS. this is how I use it:

const luisConfig: LuisApplication = {
    applicationId: [APP_ID_GOES_HERE],
    endpointKey: [KEY_GOES_HERE],
    endpoint: [ENDPOINT_GOES_HERE],
};

const recognizerOptions: LuisRecognizerOptionsV2 = {
    apiVersion: 'v2',
    bingSpellCheckSubscriptionKey: [KEY_GOES_HERE];
    includeAllIntents: true,
    log: true,
    spellCheck: true,
    log: true,
    includeInstanceData: true
};

const luisRecognizer = new LuisRecognizer(luisConfig, recognizerOptions, true);

Expected behavior

As per documentation I should get the response as follows:

"query": "bouk me a fliht to kayro",
  "prediction": {
    "alteredQuery": "book me a flight to cairo",
    "topIntent": "book a flight",
    "intents": {
      "book a flight": {
        "score": 0.9480589
      }
      "None": {
        "score": 0.0332136229
      }
    },
    "entities": {}
  }
}

But the reality is different - there is no “alteredQuery”

"query": "bouk me a fliht to kayro",
  "prediction": {
    "topIntent": "book a flight",
    "intents": {
      "book a flight": {
        "score": 0.9480589
      }
      "None": {
        "score": 0.0332136229
      }
    },
    "entities": {}
  }
}

[anishprasad01]

Feel free to open a ticket with LUIS and leave your feedback with them. In the meantime, since we have identified a workaround, I am going to go ahead and close this issue. Should you run into further issues, feel free to comment and we can reopen it. If you have new problems in the future, please open a ticket in the appropriate repository.

[mountju]

There are special options for the proper work with Bing Spell Check API in SDK (bingSpellCheckSubscriptionKey, spellCheck) but they couldn’t be used at all…