code: public static LuisRuntimeAPI authenticate(EndpointAPI endpointAPI, ServiceClientCredentials credentials) {
          return authenticate(String.format("https://%s/luis/v2.0/", endpointAPI.toString()), credentials)
              .withEndpoint(endpointAPI.toString());
      }
docs: Initializes an instance of Language Understanding (LUIS) Runtime API client.
  
  @param endpointAPI the endpoint API
  @param credentials the management credentials for Azure
  @return the Language Understanding (LUIS) Runtime API client