Currently MG does not have any built-in search engine, but Praveen Kumar has developed a proposal during his GSOC 2013 project. Some links:
- Summer of Awesome Wrap-up blog post
- Documentation related to the project
- Gitorious branch (being reviewed and polished)
A basic search plugin is also available from github. The plugin is not as full-featured or as polished as the search function described above, but it does provide a quick and easy way to perform basic searches on an instance.