This file is indexed.

/usr/share/akonadi/firstrun/birthdaycalendar is in kdepim-runtime 4:16.04.2-2+b2.

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

The actual contents of the file can be viewed below.

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[Agent]
Id=birthdaycalendar
Type=akonadi_birthdays_resource