nlu
Determines the threshold where Amazon Lex will insert the AMAZON.FallbackIntent, AMAZON.KendraSearchIntent, or both when returning alternative intents in a PostContent or PostText response. AMAZON.FallbackIntent and AMAZON.KendraSearchIntent are only inserted if they are configured for the bot. For more information see Amazon Lex Bot PutBot API Docs This value requires enable_model_improvements to be set to true and the default is 0. Must be a float between 0 and 1.