This file is indexed.

/usr/share/misc/id-lang.map is in id-utils 4.6+git20120811-4ubuntu2.

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

The actual contents of the file can be viewed below.

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# Welcome to the mkid language mapper.
#
# The format of each line is:
#
#		<pattern> <language> [options]
#
# Filenames are matched top-to-bottom against the patterns, and the
# first match is chosen.  The special language `IGNORE' means that
# this file should be ignored by mkid.  The options are
# language-specific command-line options to mkid.
#
# If a file name doesn't match any pattern, it is assigned the default
# language.  The default language may be specified here with the
# special pattern `**', or overridden from the mkid command-line with
# the `--default-lang=LANG' option.
#
# The special pattern `***' means to include the named file that
# immediately follows.  If no file is named, then the default system
# language mapper file (i.e., this file) is included.

# Default language
**			IGNORE	# Although this is listed first,
				# the default language pattern is
				# logically matched last.

# Backup files
*~			IGNORE
*.bak			IGNORE
*.bk[0-9]		IGNORE

# SCCS files
[sp].*			IGNORE

# C dependencies created by automake
*/.deps/*		IGNORE

*.h			C
*.h.in			C
*.in.h			C
*.H			C++
*.hh			C++
*.hpp			C++
*.hxx			C++

*.l			C
*.lex			C
*.y			C
*.yacc			C

*.c			C
*.C			C++
*.cc			C++
*.cpp			C++
*.CPP			C++
*.cxx			C++

*.java			Java

ChangeLog*		Cdoc

*.[sS]			asm --comment=;
*.asm			asm --comment=;

# [nt]roff
*.[0-9]			roff
*.ms			roff
*.me			roff
*.mm			roff

*.tex			TeX
*.ltx			TeX
*.texi			texinfo
*.texinfo		texinfo

# portable object (i18n)
*.po			po

*.el			lisp
*.elc			lisp
*.lisp			lisp
*.scm			lisp

*.am			make
*.mk			make
Makefile		make
Makefile.*		make
GNUmakefile		make

*.doc			text
*.txt			text
*.org			text

*.m4			m4
*.ac			m4
configure.in		m4

*.PL			perl
*.pl			perl
*.pm			perl

*.rb			perl

*.Z			FILTER gzip -d <%s
*.gz			FILTER gzip -d <%s
*.bz2			FILTER bzip2 -d <%s
*.xz			FILTER xz -d <%s
*.lzma			FILTER xz -d <%s