This file is indexed.

/etc/news/control.ctl.local is in inn2 2.5.3-3ubuntu1.

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

The actual contents of the file can be viewed below.

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##  $Id: control.ctl.local 8456 2009-05-09 17:43:11Z iulius $
##
##  Sample control.ctl.local file.
##
##  It defines local access control for control messages.
##  The rules in this file are executed after those defined
##  in control.ctl.
##  Lines are matched in order and the last matching line
##  will be used.
##
##  See the control.ctl man page for more information.

##  Output encoding for the newsgroups file.
/localencoding/:utf-8

##  Maximum number of changes that could be made at one time
##  by a checkgroups before bailing and mailing the changes
##  to the admin if no log file was specified.
/maxdocheckgroups/:*:*:10