Just upgraded to El capitan and noticed some indesign shortcuts are no longer working.
hand (space bar)
zoom (command + space)
Option + drag element is not creating a copy either, althought the cursor does change to the double cursor
Go to System Preferences > Keyboard > Keyboard Shortcuts. Change your shortcut for Spotlight (uses Command + Space by default, you can change it).
If that's not it, some third party software (often a browser extension) is grabbing keystrokes. Quit all your apps and restart. Open InDesign first before loading anything else and try again.