You want to save space by not having data on your local system but use a local search to look in the contents of files not on that system? You can't have your cake and eat it too.
Sure you can: index it once, and then stream it forevermore.
except remote contents can change
Re:Dropbox Project Infinite
by SturgeonsLaw on Tuesday April 26, 2016 @07:08PM
(#11576505)
Store a hash or checksum in the index and also allow the remote API to return the hash/checksum to see if the file has changed
That seems like a lousy tradeoff.