Per bug 42423 comment #17, it would be much better if we received an error when the search index is broken rather than receiving "0 results", as what currently happens. This assumes that Lucene actually returns a useful error message that gets tossed, rather than providing MediaWiki with 0 results in this case.
Version: unspecified
Severity: normal
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=43869
https://bugzilla.wikimedia.org/show_bug.cgi?id=42423