Can you search documents on your iCloud Drive using Spotlight? Probably, but it doesn’t seem to work using normal metadata indexes.
search
When you keep documents in iCloud, are they backed up in Time Machine, searched in Spotlight, and kept securely?
How do you get the best results from Internet searches? What about searching for images and specialist content?
How can I constrain Find and Replace in TextEdit to work on just selected text?
How can I stop Spotlight from searching all my .sql files?
How can I set up Google Advanced Search to make its use more efficient?
Yosemite’s extended search reaches out to Bing, Maps, and more. But how can you get the best out of its local search facility?
Tools to take two (or more) documents, work out the differences between them, reveal those in a manner which allows their review, and allow you to apply selected changes found in one document to the other.
The Eclectic Light Company 