From the low on 12/20, Aggressive Buying was marked three times as ES rallied. There was then a period of ranging for five days and the 10-day Control migrated to 4777.5. Price relative to this level, now Support, is worth monitoring.
There is more important Support at 4689.0, the 5mn Control. First sign of weakness mechanically would be a RTH close below 4729.50, the 12/27 Buying Day low.