/usr/share/xapian-core/ is in libxapian-1.3-5 1.3.4-0ubuntu6.
This file is owned by root:root, with mode 0o755.
..
/usr/share/xapian-core/stopwords/
/usr/share/xapian-core/stopwords/arabic.list
/usr/share/xapian-core/stopwords/danish.list
/usr/share/xapian-core/stopwords/dutch.list
/usr/share/xapian-core/stopwords/english.list
/usr/share/xapian-core/stopwords/finnish.list
/usr/share/xapian-core/stopwords/french.list
/usr/share/xapian-core/stopwords/german.list
/usr/share/xapian-core/stopwords/hungarian.list
/usr/share/xapian-core/stopwords/italian.list
/usr/share/xapian-core/stopwords/norwegian.list
/usr/share/xapian-core/stopwords/portuguese.list
/usr/share/xapian-core/stopwords/russian.list
/usr/share/xapian-core/stopwords/spanish.list
/usr/share/xapian-core/stopwords/swedish.list