The Sixers' season ended Thursday night at Wells Fargo Center with a wild, 118-115 loss in Game 6 to the Knicks.
It was Brunson's third-straight 40-point game.
The role players stepped up with Obi Toppin scoring 21 points, T.J. McConnell 20 for Indiana.
Heat head coach Erik Spoelstra credited the Celtics' maturity after they closed out the series 4-1, cruising to the Eastern Conference Semifinals.