If enabled files on network shares made available offline are not indexed. Otherwise they are indexed. Disabled by default.
1 Registry path is: on July 5, 2015 at 8:30 pm HKEY_LOCAL_MACHINE -> SOFTWARE -> Policies -> Microsoft -> Windows -> Windows Search # PreventIndexingOfflineFiles
HKEY_LOCAL_MACHINE -> SOFTWARE -> Policies -> Microsoft -> Windows -> Windows Search # PreventIndexingOfflineFiles
Windows Components -> Search