Fixed in the next release.
VaultWiki should still be getting indexed. Most of these fields are not important, as they are metadata fields that XF search doesn't need anyway.
Exceptions:
- vwtype: Since this is not indexed by XFES, attempting to constrain by wiki page-type on the advanced search form won't work.
- ischild: Since this is not indexed by XFES, attempting to show only comments from main discussions won't work.