this.cluster = leaflet.markerClusterGroup({
    zoomToBoundsOnClick: false,
    showCoverageOnHover: false,
    spiderfyDistanceMultiplier: 3,
    spiderLegPolylineOptions: {
        weight: 1.5,
        color: "#1BA5D0",
        lineCap: "butt",
        dashArray: "10 10",
        opacity: 0.5
    }
});