Our federation wide search runs a scrape four times a day to update flat-file indices that are searched on demand with a plugin and several related tools. github 
This site provides details about the parts and how they are connected together. This is most useful when adding new features to this centralized service.
Try the footer neighborhood search or browse our composable subsystem diagrams.
New work using solo collaborator over graphs extracted from annotations added to scripts.
We return again to the collection of mostly Ruby scripts that implement federation search motivated by fending off slow decay based on growth and evolution in the federation itself. github