Stress, yes.

Apply the water directly to the rootball more often than to the surrounding area. Likely you'll need to trickle it in.

The biggest mistake I have made with newly planted maples in the past is to over-water them. Maples like moist soil, not wet soil. I would never water a maple every day. I would put mulch near (but not touching) the base of the tree and water about twice a week, even for newly planted trees.

The great thing about maples is that they will rebound with fresh new leaves next spring. Also, they get more and more heat/sun tolerant each year they are in the ground. I have found it takes around 3 full growing seasons before they reach their peak heat/sun tolerance.

-Brett