This file is indexed.

/usr/share/gmt/custom/hexagon.def is in gmt-common 5.3.1+dfsg-2.

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: hexagon.def 12822 2014-01-31 23:39:56Z remko $
#
#	Definition file for hexagon symbol.  Use in psxy
#	as -Skhexagon/size.  Unlike -Sh, this allows for
#	using patterns as fill
#
0.5		0		M
0.25		0.433012702	D
-0.25		0.433012702	D
-0.5		0		D
-0.25		-0.433012702	D
0.25		-0.433012702	D