This file is indexed.

/etc/xdg/kservice.categories is in libkf5service-data 5.44.0-0ubuntu1.

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

The actual contents of the file can be viewed below.

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kf5.kservice.services service (kservice lib)
kf5.kservice.sycoca sycoca (kservice)