INDIANAPOLIS — The Miami Heat weren’t looking for anything ostentatious Sunday, seeking nothing more than closing their six-game trip at .500 and evening their overall record at .500. Ultimately, even that degree of modesty proved out of reach Sunday night at Gainbridge Fieldhouse, falling 119-110 to the Indiana Pacers in the teams’ rematch of the Heat’s Friday victory. So a 2-4 trip and a 5-7 record a dozen games in, with a schedule that hardly eases, with the Philadelphia 76ers, Dallas Mavericks and Milwaukee Bucks up next. Like those three opponents, the Heat continue to struggle to gain their footing through the season’s opening weeks, unable to sustain. “We feel like we’re making some strides of figuring out what our identity is to win basketball games,” Heat coach Erik Spoelstra said.