/usr/share/maven-repo/org/apache/maven/indexer/indexer-core/5.1.1/indexer-core-5.1.1.jar is in libmaven-indexer-java 5.1.1-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/maven-repo/org/apache/maven/indexer/indexer-core/5.1.1/../../../../../../../java/maven-indexer-core.jar