INDIANAPOLIS — Gordon Hayward scored 20 points and Marcus Morris started a decisive 3-point flurry late in the fourth quarter Sunday to give the Boston Celtics a series-clinching 110-106 victory at Indiana. It’s the first four-game sweep for the Celtics since 2011 and their second since 1986-87, becoming the first team to reach the second round of the playoffs. Bojan Bogdanovic finished with 22 points and Tyreke Evans finished with a playoff career-high of 21 to lead the Pacers.