/usr/share/xindy/lang/spanish/ is in xindy-rules 2.4-1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/xindy/lang/spanish/modern-latin1-lang.xdy
/usr/share/xindy/lang/spanish/modern-latin1-test.xdy
/usr/share/xindy/lang/spanish/modern-latin1.xdy
/usr/share/xindy/lang/spanish/modern-utf8-lang.xdy
/usr/share/xindy/lang/spanish/modern-utf8-test.xdy
/usr/share/xindy/lang/spanish/modern-utf8.xdy
/usr/share/xindy/lang/spanish/traditional-latin1-lang.xdy
/usr/share/xindy/lang/spanish/traditional-latin1-test.xdy
/usr/share/xindy/lang/spanish/traditional-latin1.xdy
/usr/share/xindy/lang/spanish/traditional-utf8-lang.xdy
/usr/share/xindy/lang/spanish/traditional-utf8-test.xdy
/usr/share/xindy/lang/spanish/traditional-utf8.xdy