This file is indexed.

/usr/share/mailutils/mh/mhl.headers is in mailutils-mh 1:3.1.1-1.

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

The actual contents of the file can be viewed below.

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; mhl.headers
;
; GNU Mailutils -- a suite of utilities for electronic mail
; Copyright (C) 2010-2012, 2014-2016 Free Software Foundation, Inc.
; Distributed under GPLv3+.  See <http://gnu.org/licenses/gpl.html>.
;
; Mhn uses this format file for displaying headers in MIME messages. 
;
overflowtext="***",overflowoffset=5
leftadjust,compwidth=9
ignores=msgid,message-id,received,content-type,content-transfer-encoding,content-id
Date:formatfield="%<(nodate{text})%{text}%|%(pretty{text})%>"
To:
cc:
From:decode
Subject:decode
:
extras:nocomponent
:
; End of mhl.headers