Exclude target folder from search results in Eclipse
Go to Add Resource Filter preferences dialog:
Go to Project → Properties → Resource → Resource Filters
Click Add Filter...
Then fill the options:
Filter type:
(•)Exclude all
Applies to:
(•)Folders
[X] All children (recursive)
Filter and Folder Attributes:
Name - Matches - [target]
Mark the "target" folders as "derived" resource from the properties screen of those folders (this option is next to read only and archive property).
In the quick search (Ctrl+Shift+R) screen press the arrow in the top right corner and untick "Show derived resources".
Then those target-files will not be considered in the quick search anymore.