Sputnik integrates with the Google API to allow you to do Google search of you wiki.
To use this feature you would need to get a Google API key
and then set SPUTNIK_CONFIG.SEARCH_API_KEY to this key in your sputnik.cgi:
SPUTNIK_CONFIG.SEARCH_API_KEY = "ABKWOSPDX8ZTWZzPsrmrmzz6NKSDJSLmBcwDaphwNX_Pcim6h92CZR3nwBSPf31zs40k1pPNcSfh23Fnh3ZAYw"
(Don't paste the key above: it won't work.)