Can Unseen Servant count as an ally for a sneak attack?

@JeremyECrawford Can Unseen Servant count as an adjacent ally for a rogue's sneak attack?

— Ryan (@Rohn72) October 16, 2015

Unseen servant creates "an invisible, mindless, shapeless force." In combat, it doesn't act as an enemy/ally. #DnD https://t.co/ohcgLAvURt

— Jeremy Crawford (@JeremyECrawford) October 16, 2015