I came here to report the bug but I see too many other people reported it already.
When this bug will be fixed? Any estimated time?
Topic on Manual talk:UpdateSearchIndex.php
There's only one message in addition to the one you posted, and the bug in Phabricator linked from the other thread is closed as invalid, so apparently there's no bug here.
@Ciencia Al Poder Right now I am getting that error message with the latest clean and un-customized version. So this bug still exists.