If you're using an updated version of InDesign, you'll find that if you highlight your current fraction you'll see a blue highlight under the text with options for proper fractions displayed. Choose the fraction and it will apply the proper fraction to your text. Keep in mind, this will only work if you're using an OpenType font. All Adobe Fonts available with your subscription are OpenType fonts.
If you're not using an OpenType font and you don't have the ability to change it, use Dan Rodney's script as Colin Flashman suggestions in the previous post.