- open Indexing Options (get to there from the Start Menu, or from Control Panel)
- click on Advanced
- go to the File Types tab
- find doc, docx, or whatever in the list
- change from "Index Properties and File Contents" to "Index Properties Only"
Honestly I haven't tried this so I can't vouch for it, but it seems to be the official way to go.
- open Indexing Options (get to there from the Start Menu, or from Control Panel)
- click on Advanced
- go to the File Types tab
- find doc, docx, or whatever in the list
- change from "Index Properties and File Contents" to "Index Properties Only"
Honestly I haven't tried this so I can't vouch for it, but it seems to be the official way to go.