This file is indexed.

/usr/share/calendar/pt_BR/calendar.holidays is in bsdmainutils 11.1.2ubuntu1.

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

The actual contents of the file can be viewed below.

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/*
 * $FreeBSD: head/usr.bin/calendar/calendars/pt_BR.UTF-8/calendar.holidays 219937 2011-03-23 21:22:03Z edwin $
 *
 * Originally submitted by Renato Tambellini <rtsanch@gmail.com>
 *
 * Brazilian holidays
 *
 * Federal laws 662/1949, 6.802/1980, 9.093/1995 and 10.607/2002.
 */

#ifndef _pt_BR_UTF_8_holidays_
#define _pt_BR_UTF_8_holidays_

LANG=UTF-8

01/01	Dia da confraternização universal e da paz
04/21	Dia do Tiradentes
05/01	Dia do trabalho
09/07	Dia da independência do Brasil
10/12	Dia da Nossa Senhora Aparecida
11/02	Dia de Finados
11/15	Dia da proclamação da República
12/25	Natal

#endif