In the documentation there is no setOptions() Method but there is one
that it works

myMap = new google.maps.Map(document.getElementById("mapDiv"),
myOptions);

directionsDisplay.setMap(myMap);

var directionRendererOptions ={
                suppressMarkers: true,
                preserveViewport: true,
                polylineOptions:{
                        strokeColor: "#FF0000",
                        strokeOpacity: 0.5,
                        strokeWeight: 3
                        }
                };

directionsDisplay.setOptions(directionRendererOptions);

And it changes the polyline !

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