Need some help configuring an ACK handler for a custom beat

First of, I tried finding on the tags options a "custom beat" tag, but there is not one there, could I suggest adding such a tag?

I have created a custom beat based on libbeat v7.
I have defined a struct that implements the beat.ACKer interface.

//ACKerStruct ... Define ACK handler
type ACKerStruct struct{}

var eventsTrackSem = sync.Mutex{}
var eventsLeft = 0

//AddEvent .. Does nothing, is an interface requirement.
func (ah *ACKerStruct) AddEvent(event beat.Event, published bool) {
	fmt.Println("AddEvent Has been Called")
	fmt.Printf("\nBeat Event: %v\n", event)
	fmt.Printf("\nPublished Value: %v\n", published)
}

//ACKEvents ... decreases the list eventsLeft, shielded behind a semaphor.
func (ah *ACKerStruct) ACKEvents(n int) {
	fmt.Printf("\nACKEvents called with n = %v\n", n)
	eventsTrackSem.Lock()
	eventsLeft -= n
	eventsTrackSem.Unlock()
}

//Close ... Does nothing, is a interface requirement.
func (ah *ACKerStruct) Close() {}
func increaseEventCount() {
	eventsTrackSem.Lock()
	eventsLeft++
	eventsTrackSem.Unlock()
}

Now, in the New function that creates my beat, I added the code:

//New ... Creates an instance of coletorbeat.
func New(b *beat.Beat, cfg *common.Config) (beat.Beater, error) {
	c := config.DefaultConfig
	if err := cfg.Unpack(&c); err != nil {
		return nil, fmt.Errorf("Error reading config file: %v", err)
	}

	myackhandler := &ACKerStruct{}
	client, err := b.Publisher.ConnectWith(beat.ClientConfig{
		PublishMode: beat.GuaranteedSend,
		Processing:  beat.ProcessingConfig{},
		CloseRef:    nil,
		WaitClose:   30 * time.Second,
		ACKHandler:  myackhandler,
	})
	if err != nil {
		panic(err)
	}

	bt := &coletorbeat{
		done:   make(chan struct{}),
		config: c,
		client: client,
	}

	return bt, nil
}

I expected to see the prints when I run the beat, whenever an event is sent to the pipeline, but I don't see anything, it is as if the ACKer function is not being called at all.
I would like some help finding out what I'm doing wrong if you can.
Thats it