How to remove Google directionsService stock labels?

Question

JavaScript

I am building a route from the mero to the point. But I want to remove the stock markers. Does anyone know how to do this?
Looks like that

The code

window.marker = null;

//построение пути подключение
var directionsDisplay;
var directionsService = new google.maps.DirectionsService();
var map;

function initialize() {
    directionsDisplay = new google.maps.DirectionsRenderer();
    var nottingham = new google.maps.LatLng(53.862206,27.6584556);
    var centermap = new google.maps.LatLng(53.864527,27.653266);
    var metro =  new google.maps.LatLng(53.868461,27.650078);
//стили карты
    var style = [
        {
            "featureType": "road.highway",
            "elementType": "geometry",
            "stylers": [
                { "saturation": -100 },
                { "lightness": -8 },
                { "gamma": 1.18 }
            ]
        }, {
            "featureType": "road.arterial",
            "elementType": "geometry",
            "stylers": [
                { "saturation": -100 },
                { "gamma": 1 },
                { "lightness": -24 }
            ]
        }, {
            "featureType": "poi",
            "elementType": "geometry",
            "stylers": [
                { "saturation": -100 }
            ]
        }, {
            "featureType": "administrative",
            "stylers": [
                { "saturation": -100 }
            ]
        }, {
            "featureType": "transit",
            "stylers": [
                { "saturation": -100 }
            ]
        }, {
            "featureType": "water",
            "elementType": "geometry.fill",
            "stylers": [
                { "saturation": -100 }
            ]
        }, {
            "featureType": "road",
            "stylers": [
                { "saturation": -100 }
            ]
        }, {
            "featureType": "administrative",
            "stylers": [
                { "saturation": -100 }
            ]
        }, {
            "featureType": "landscape",
            "stylers": [
                { "saturation": -100 }
            ]
        }, {
            "featureType": "poi",
            "stylers": [
                { "saturation": -100 }
            ]
        }, {
        }
    ];
//опции карты
    var mapOptions = {
        // SET THE CENTER
        center: centermap,

        // SET THE MAP STYLE & ZOOM LEVEL
        mapTypeId: google.maps.MapTypeId.WALKING,

        // SET THE BACKGROUND COLOUR
        backgroundColor:"#000",

        // REMOVE ALL THE CONTROLS EXCEPT ZOOM
        zoom:15.2,
        panControl:false,
        zoomControl:true,
        mapTypeControl:false,
        scaleControl:false,
        streetViewControl:false,
        overviewMapControl:false,
        zoomControlOptions: {
            style:google.maps.ZoomControlStyle.LARGE
        }

    };

//Инициализация с опциями
    map = new google.maps.Map(document.getElementById('map'), mapOptions);
    directionsDisplay.setMap(map);
    // SET THE MAP TYPE
    var mapType = new google.maps.StyledMapType(style, {name:"Grayscale"});
    map.mapTypes.set('grey', mapType);
    map.setMapTypeId('grey');

    //CREATE A CUSTOM PIN ICON
    var marker_image ='plugins/google-map/images/marker.png';
    var pinIcon = new google.maps.MarkerImage(marker_image,null,null, null,new google.maps.Size(74, 73));

    marker = new google.maps.Marker({
        position: nottingham,
        map: map,
        icon: pinIcon,
        title: 'Медико-Санитарная часть МАЗ'
    });

    calcRoute(nottingham , metro);
}

function calcRoute(point1, point2) {
    var start = point1;
    var end = point2;
    var request = {
        origin: start,
        destination: end,
        travelMode: 'WALKING'
    };
    directionsService.route(request, function (result, status) {
        if (status == 'OK') {
            directionsDisplay.setDirections(result);
        }
    });
}

google.maps.event.addDomListener(window, 'load', initialize);

Answer 1

try instead
directionsDisplay = new google.maps.DirectionsRenderer();
this
directionsDisplay = new google.maps.DirectionsRenderer({suppressMarkers: true});