Not indexed; you have to browse through them.
https://www.familysearch.org/search/collection/1876640
I've only just noticed this and not had a chance to play with it yet, but I'm not sure what the point is of this when the actual wills are searchable and viewable for free on the National Library of Wales website? This new database does include administrations and I'm not sure whether those are on the NLW site, will check tomorrow if someone else hasn't by then!