This file is indexed.

/etc/freeradius/3.0/mods-available/utf8 is in freeradius-config 3.0.16+dfsg-1ubuntu3.

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

The actual contents of the file can be viewed below.

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#
#  Enforces UTF-8 on strings coming in from the NAS.
#
#  An attribute of type "string" containing UTF-8 makes
#  the module return NOOP.
#
#  An attribute of type "string" containing non-UTF-8 data
#  makes the module return FAIL.
#
#  This module takes no configuration.
#
utf8 {

}