This file is indexed.

/usr/share/kubuntu-default-settings/kf5-settings/muondatasourcesrc is in kubuntu-settings-desktop 1:18.04ubuntu11.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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[muon]
FeaturedSource=file:///usr/share/kubuntu-default-settings/kf5-profile/default/share/apps/muon-discover/featured.json