This file is indexed.

/etc/xdg/khelpcenter.categories is in khelpcenter 4:16.08.3-1.

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

The actual contents of the file can be viewed below.

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org.kde.khelpcenter KHelpCenter (main application)
org.kde.khelpcenter.xapian.cachereader KHelpCenter (Xapian cache reader)
org.kde.khelpcenter.xapian.htmltextdump KHelpCenter (Xapian HTML text dump)
org.kde.khelpcenter.xapian.common KHelpCenter (Xapian common)
org.kde.khelpcenter.xapian.indexer KHelpCenter (Xapian indexer)
org.kde.khelpcenter.xapian.search KHelpCenter (Xapian search)