/usr/share/java/lucene-spellchecker.jar is in liblucene2-java 2.9.4+ds1-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/lucene-spellchecker-2.9.4.jar
/usr/share/java/lucene-spellchecker-2.9.4.jar