Warning on adduser that home dir doesn't belong to zookeeper user

Warning during installation on 18.04:

adduser: Warning: The home directory `/var/lib/zookeeper' does not belong to the user you are currently creating.

zookeeper.postinst has this:

"""
# creating zookeeper user if it isn't already there
if ! getent passwd $USER >/dev/null ; then
        # Adding system user
        adduser \
          --system \
          --disabled-login \
          --ingroup $GROUP \
          --home $DATADIR \
          --gecos "ZooKeeper" \
          --shell /bin/false \
          $USER >/dev/null
fi
"""

A fix/workaround may be to add --no-create-home for the adduser command.