count-index.go
func (countIndex *CountIndex) Remove(id string) {
	if prev, ok := countIndex.currentPosition[id]; ok {
		countIndex.index.GetEntryAt(prev).(counter).Remove(prev)
		delete(countIndex.currentPosition, id)
	}
}
func (countIndex *CountIndex) Remove(id string) {
	if prev, ok := countIndex.currentPosition[id]; ok {
		countIndex.index.GetEntryAt(prev).(counter).Remove(prev)
		delete(countIndex.currentPosition, id)
	}
}
// Remove removes a point.