Comment # 2 on bug 948812 from Wolfgang Bauer

(In reply to Joachim Wagner from comment #1)
> Leap 42.1 RC1: Runner now shows no content results at all. Maybe related to
> the "Invalid protocol" message in Dolphin.

No.

As mentioned in bug#948810, apparently kfilemetadata5 is built without
poppler-qt5 because it isn't available in Leap.
That means, indexing PDF files is *not* supported at all, and not even
displaying metadata for PDF files is supported.

And I don't think anything can be done about it either.