With the current configuration CKEditor does store accented characters not as UTF-8. So démo is stored as
. This results in "demo" or "démo" not being indexed and these words as search terms do not give results. If the accented word is a in String field they are being indexed correctly.
Comment from Ard:
Ps seems a simple ckeditor configuration option afaics:
we should set both to false afaics.