Mineforgian
Just drag and drop the world download into saves folder, Unless your installing through the curseforge app.
This was provided by Declan Pitts 'AKA' CommuniytMC So all thanks go to him. here is the twitter link - https://twitter.com/NALC3D/status/679986278897725441
The nether biome is a super flat world, and the end is restructured. so, I'm gonna say it for the first time lol #BlameDec.
So, if you really think about it, it's just for looks.
ENJOY :) and thanks to the best Minecraft series ever created.