/usr/lib/x86_64-linux-gnu/libclucene-contribs-lib.so.1 is in libclucene-contribs1 2.3.3.4-4build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libclucene-contribs-lib.so.2.3.3.4