How to use the botbuilder-applicationinsights.TelemetryInitializerMiddleware function in botbuilder-applicationinsights

// Send a message to the user
    let onTurnErrorMessage = 'The bot encountered an error or bug.';
    await context.sendActivity(onTurnErrorMessage, onTurnErrorMessage, InputHints.ExpectingInput);
    onTurnErrorMessage = 'To continue to run this bot, please fix the bot source code.';
    await context.sendActivity(onTurnErrorMessage, onTurnErrorMessage, InputHints.ExpectingInput);
    // Clear out state
    await conversationState.delete(context);
};

// Set the onTurnError for the singleton BotFrameworkAdapter.
adapter.onTurnError = onTurnErrorHandler;

// Add telemetry middleware to the adapter middleware pipeline
var telemetryClient = getTelemetryClient(process.env.InstrumentationKey);
var telemetryLoggerMiddleware = new TelemetryLoggerMiddleware(telemetryClient);
var initializerMiddleware = new TelemetryInitializerMiddleware(telemetryLoggerMiddleware);
adapter.use(initializerMiddleware);

// Define a state store for your bot. See https://aka.ms/about-bot-state to learn more about using MemoryStorage.
// A bot requires a state store to persist the dialog and user state between messages.

// For local development, in-memory storage is used.
// CAUTION: The Memory Storage used here is for local bot debugging only. When the bot
// is restarted, anything stored in memory will be gone.
const memoryStorage = new MemoryStorage();
const conversationState = new ConversationState(memoryStorage);
const userState = new UserState(memoryStorage);

// If configured, pass in the FlightBookingRecognizer.  (Defining it externally allows it to be mocked for tests)
const { LuisAppId, LuisAPIKey, LuisAPIHostName } = process.env;
const luisConfig = { applicationId: LuisAppId, endpointKey: LuisAPIKey, endpoint: `https://${ LuisAPIHostName }` };