Two years ago, at the start of the Celtics’ revival, the team clinched a playoff spot with two games left in the regular season. It was cause for celebration then, as the plucky team that started with a 16-30 record had arrived in the postseason a year earlier than most expected.

On Tuesday, on a night they did not play, the Celtics clinched a playoff spot for the third year in a row. This time, though, it was just a formality. Aside from a post on the team’s Twitter account, there was no sign of celebration.

“We’re looking for bigger things than that,’’ point guard Isaiah Thomas said after Boston’s 109-100 win over the Pacers on Wednesday. “It feels good to clinch, especially 10 or 11 games before the season is over, but we’ve got a bigger goal.’’

They would like to secure the No. 1 seed in the Eastern Conference, and the Cavaliers’ loss to the Nuggets on Wednesday left the Celtics just one game out of the top spot. But, most importantly, they would like to get into the playoffs and stay there for a while, which is something this group has not done.

Thomas hosts a Memorial Day basketball tournament each year in his hometown of Tacoma, Wash. In other years, his NBA teams had finished playing long before that. This year, though, he is moving it back, just in case.

The Celtics will use the final few weeks of the regular season to establish their rhythm, and if they happen to string together wins, it will be a bonus.

“This time of year, the teams that are ready to make runs in the playoffs are trying to figure out how they can get better,’’ Al Horford said. “They’re not worrying about who is winning and losing.’’

The Celtics have won 12 of their last 13 games at TD Garden, and they’re now just two games into a six-game homestand, their longest of the season. Horford said he has been looking forward to this stretch ever since the schedule was released last summer.

“Now, we’re taking advantage of it,’’ he said, “one game at a time.’’

Thomas led the Celtics with 25 points and six assists Wednesday. Paul George, who played the entire second half, scored 37 points for the Pacers. The Celtics entered Wednesday having made just 23 of 91 3-pointers over the previous three games, but they hit 11 of 27 (40.7 percent) against Indiana.

Earlier this week, coach Brad Stevens said he was concerned that there were stretches in which his team played too casually. The Celtics are not good enough to succeed when they play that way, Stevens said, and he cautioned that they must fix it.

Then Wednesday’s game started, and passes were booted, dribbles were botched, and Boston generally appeared out of synch. The Celtics entered the game averaging 13.2 turnovers per game, and they topped that mark by halftime.

“There were moments in the first half where we were careless,’’ Stevens said, “and then there were moments that it was just like one of those nights where for whatever reason we missed a few catches, we missed a few easy passes.’’

The Celtics committed four turnovers in the first six minutes, and that was a harbinger. With 5 minutes, 29 seconds left in the second quarter a miscue by Thomas led to a George 3-pointer.

Just 22 seconds later, a bad pass by Kelly Olynyk resulted in another George three that gave Indiana a 35-34 lead.

Despite those errors, the Celtics made their shots when they managed to hoist them. They hit 7 of 14 3-pointers in the first half, including a buzzer-beating shot by Avery Bradley that gave his team a 49-42 lead.

“I felt like we were trying to play the right way,’’ Horford said. “We were really trying to find open guys and we were just playing a little too fast. Once we slowed down, it got better.’’

At halftime, Stevens told his team that if it took better care of the ball and rebounded more efficiently, it would win. Even though the Celtics were actually pummeled on the glass in the second half, 27-15, they committed just three turnovers, and that, combined with their hot shooting, was enough.

Tyler Zeller gave Boston a lift in the third quarter.

He hit a jumper and converted a dunk before Thomas floated an over-the-head pass to Olynyk, who found Zeller for a basket as he was fouled. The Celtics made 17 of 25 shots in the third quarter and took an 88-74 lead to the fourth.

With 9:58 left, an alley-oop to Jaylen Brown tied the Celtics’ largest lead, 93-76.

The Pacers responded with a 10-0 burst that included 3-pointers by Jeff Teague and George. Indiana pulled within 6 points, but the Celtics did not allow them to get any closer.

“Things are clicking for us,’’ Thomas said. “We’re playing at a level that’s kind of high right now, and we want to just keep that going into these last 10 games.’’

Adam Himmelsbach can be reached at adam.himmelsbach@globe.com. Follow him on Twitter @adamhimmelsbach.