The search web application will report what it has found scraping the visible federation based on search terms you provide and options you select. site 
choices
We search various properties of pages for exact matches of search terms. Select what you would like to find.
words
― whole words found in item text.
links
― whole words found in link slugs.
sites
― sites found in items or actions.
items
― item ids found in stories.
plugins
― plugin types used in stories.
We select based on matches of any or all these terms.
all
― match when all terms are present.
any
― match when any one term is present.
We report either the sites or the pages within sites where the terms are found.
sites
― sites were any combination of pages match.
pages
― pages that match by themselves.
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Search terms and choices appear in the browser's location bar as a url that can be saved and rerun at any time. See Federation Search for other options.