By default in S32DS one has to press Ctrl-space for autocomplete.
Go to the S32DS Windows menu -> Preferences -> Java -> Editor -> Content assist and checking the settings here.
Even by using the default settings, the content assist is not working.
Viewing on variable's declaration, by pressing Ctrl+Left Click(F3) on variable, it pops an error "Could not find symbol 'abc' in Index".
Build-all does not pops any error though.