Making "Quick Access" search field optional is a long-awaited feature in Eclipse. Now this is possible according to the Eclipse Luna project site. My question is: how we can remove it? I found no option for it in the settings or the perspective customization.
You can right-click on the Quick Access toolbar and select Hide. Described in the New and Noteworthy for the platform: https://www.eclipse.org/eclipse/news/4.4/eclipse-news-part1.php#quick-access