* @param evt Event.
* @return Entry.
*/
protected Entry<E, K, V> removeEvent(GridStreamerIndexEntry<E, K, V> oldEntry, K key, V val,
@Nullable IndexKey<V> idxKey, E evt) {
GridStreamerIndexPolicy plc = getPolicy();
switch (plc) {
case EVENT_TRACKING_OFF:
return new NonTrackingEntry<>(key, val, idxKey);