Update maven indexing process to index the cloudfiles repo

[tobias]

We provide a maven index using org.apache.maven.indexer/indexer-core, which provides an entry point for indexing an on-disk repo. We would need to use other classes within that library to build an indexer that uses the cloud repo instead of the on-disk one if we want to get rid of the on-disk repo.

[tobias]

This is no longer relevant - the new server synchronizes the poms and maven-metadata from the repo bucket locally, which is enough to index via indexer-core.