The "Repack" term primarily exists in the archival/piracy community. For an authentic, legal experience, you can remux (combine) a legal BluRay rip with a legally obtained Hindi audio track using free tools like MKVToolNix .
The original DTS-HD Master Audio 5.1 is an "exceptional audio presentation" with aggressive surround use, from horse-drawn carriages tracking across channels to Hans Zimmer's booming score. sherlock holmes 2009 bluray dual audio hindi en repack