Jelly Bean search - only contacts and apps?
The Universal Search function had to be limited on newer Android versions due to one of Apple's lawsuits. Thanks to this, the search behaviour had to be modified and can't be restored without rooting the device.

For rooted devices the situation is somewhat better since you can replace GoogleQuickSearch.apk with a modified version. You can see the steps on XDA. As always with modifications requiring root, use caution. I'm not certain if the APK is device-dependant.