This extension allows you to use the codesearch code indexing system in emacs.
For more details, see the project page at https://github.com/abingham/codesearch.el.
For more details on codesearch, see its project page at http://code.google.com/p/codesearch/.
Copy codesearch.el to some location in your emacs load path. Then add (require 'codesearch) to your emacs initialization (.emacs, init.el, or something).