This file is indexed.

/usr/share/X11/xkb/symbols/hr is in xkb-data 2.5-1ubuntu1.

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

The actual contents of the file can be viewed below.

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default partial alphanumeric_keys
xkb_symbols "basic" {

    name[Group1]="Croatian";

    include "rs(latin)"

    // Redefine these keys to match XFree86 Croatian layout
    key <AE01> { [         1,     exclam,   asciitilde,   dead_tilde ] };
    key <AE03> { [         3, numbersign,  asciicircum, dead_circumflex ] };
    key <AE05> { [         5,    percent,       degree, dead_abovering ] };
    key <AE07> { [         7,      slash,        grave,   dead_grave ] };
    key <AB10> { [     minus, underscore, dead_belowdot, dead_abovedot ] };
};

partial alphanumeric_keys 
xkb_symbols "us" {

    name[Group1]= "Croatian (US keyboard with Croatian letters)";

    include "us"

    key <AD01> { [    any,    any,	backslash	        ] };
    key <AD02> { [    any,    any,	bar      	        ] };
    key <AD03> { [    any,    any, 	EuroSign 	        ] };
    key <AD06> { [    any,    any,	z,		Z       ] };
    key <AD11> { [    any,    any, 	scaron,		Scaron  ] };
    key <AD12> { [    any,    any, 	dstroke, 	Dstroke ] };
    key <AC04> { [    any,    any,	bracketleft             ] };
    key <AC05> { [    any,    any,	bracketright            ] };
    key <AC08> { [    any,    any, 	lstroke                 ] };
    key <AC09> { [    any,    any,	Lstroke                 ] };
    key <AC10> { [    any,    any,	ccaron,		Ccaron  ] };
    key <AC11> { [    any,    any, 	cacute,		Cacute  ] };
    key <LSGT> { [    any,    any, 	bar			] };
    key <AB01> { [    any,    any,	y,		Y       ] };
    key <AB04> { [    any,    any,	at                      ] };
    key <AB05> { [    any,    any,	braceleft               ] };
    key <AB06> { [    any,    any,	braceright              ] };
    key <AB07> { [    any,    any,	section                 ] };
    key <AB08> { [    any,    any, 	semicolon               ] };
    key <AB09> { [    any,    any, 	colon			] };
    key <AB10> { [    any,    any, 	minus,    underscore  	] };
    key <BKSL> { [    any,    any,	zcaron,	    Zcaron      ] };

    include "level3(ralt_switch)"

};


partial alphanumeric_keys 
xkb_symbols "alternatequotes" {

    name[Group1]= "Croatian (use guillemets for quotes)";

    include "rs(latinalternatequotes)"
};

partial alphanumeric_keys 
xkb_symbols "unicode" {

    name[Group1]= "Croatian (use Croatian digraphs)";

    include "rs(latinunicode)"
};

partial alphanumeric_keys 
xkb_symbols "unicodeus" {

    name[Group1]= "Croatian (US keyboard with Croatian digraphs)";

    include "rs(latinunicodeyz)"
};