3 - Crawler and indexer with the ability to run many in parallel
4 - Shows and highlights text that contains search words
5 - Boolean search queries:
7 - ``foo bar`` searches for ``foo AND bar``
9 - ``title:foo`` searches for ``foo`` only in the page title
10 - Facets for tag, domain, language and type
13 - Query: ``foo bar site:example.org/dir/``
14 - or use the ``site`` GET parameter:
15 ``/?q=foo&site=example.org/dir``