is one piece episode 479 filler?

When Ace is about to be executed, Whitebeard tries to intervene but he is stopped because of the wounds he received. Much to the shock of the Commanders and Jinbe, Luffy uses his Haoushoku Haki unconsciously, preventing Ace from being executed because the executioners fainted.

Many of the Marines also faint and even a few of the Whitebeard Pirates. Ivankov then asks Luffy how he gained that power, to which Luffy says he does not know.

Rakuyo comments it's the Conqueror Haki. Aokiji is surprised and sweating a bit, and Kizaru said he was surprised in a sarcastic way.