I used to be able to search InDesign's menu going Help > Search like in image attached.
Real time saver with those complex menus. After I've updated to Sierra this option is unfortunately gone. What puzzles me most, is that my friend with exact same OS and exact same InD version (CC 2014) still has this option! So there must be a way to activate it somehow.
InDesign CC 2014 isn't supported on Sierra (just Mac OS X v10.7, v10.8, v10.9, or v10.10 as per System requirements for Adobe InDesign CC for Mac and Windows OS) so you can expect it to be a little flaky. Since you have the CC subscription, have you considered the free upgrade to the current version?