It’s unlikely there would be much appeal for an OS just to play, since Minecraft would require a desktop environment and it would be a hard sell to say ‘format your hdd just to play one game’.
Typically it’s the server that really only is super demanding. But to that end, any Linux distro that claims to be a minimalistic desktop distro would be your answer, since there is no meaningful client-side tweaking for a JVM app.
Find a distro that advertises minimalism, has XFCE desktop by default, and install Java and that should be it. But again, probably more work than it’s worth compared to, say, Linux Mint and installing Minecraft, since you’re getting mostly the same performance out of it, likely.