The keyboard shortcut is now CTRL+Alt+Shift+L. Some background as to why...
The STS Quick Search was contributed to Eclipse and is now bundled with Eclipse proper. However, the old keyboard shortcut has a conflict with "Show Key Assist" keyboard shortcut and this was not acceptable. So, when we contributed Quick Search to Eclipse, we had to pick something else for a shortcut.
If you don't care much about the "Show Key Assist" having a shortcut and are already used to CTRL+Shift+L for quicksearch. you can change the keybinding via Eclipse preference.