This file is indexed.

/usr/share/kservices5/recentdocuments.protocol is in kio-extras-data 4:17.12.3-0ubuntu2.

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

The actual contents of the file can be viewed below.

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[Protocol]
X-DocPath=kioslave5/recentdocuments/index.html
exec=kf5/kio/recentdocuments
protocol=recentdocuments
Icon=document-open-recent
input=none
output=filesystem
listing=Name,Type,Size,Date,AccessDate,Access,Owner,Group,Link
reading=true
opening=true
writing=true
deleting=true
maxInstances=1
Class=:local