TimeStamp) {
                    var bound = wrapLatLngBounds(map.getBounds());
                    var prec = recalcLevel(map.getZoom());
                    client.search({
                            index: 'cluster_tracker', //数据库名称
                            body: {
                                size: 0, //此处返回的是hits的数组大小
                                query: {
                                    bool: {
                                        filter: {
             