Eclipse allows to search and provides different tabs for different search cases. In 99% of the cases I want to use the File search but in most cases I end in the Java or Plug-in search.
Marc Philipp suggested via Twitter a nice “hard” solution, you can turn off all other search tabs via the customize button in the search dialog.
Works for me, and if I really need another search tab I can turn it on temporarily. I added this info also to my Eclipse IDE tutorial.