core/src/main/java/org/commonjava/indy/core/content/DefaultContentManager.java
private boolean deleteCache( ArtifactStore store, String path, EventMetadata eventMetadata )
                    throws IndyWorkflowException
    {
        logger.trace( "Delete cache, store:{}, path:{}", store.getName(), path );
        if ( hosted == store.getKey().getType() )
        {
            return false;
        }
        else
        {
            return downloadManager.delete( store, path, eventMetadata );
        }
    }
private boolean deleteCache( ArtifactStore store, String path, EventMetadata eventMetadata )
                    throws IndyWorkflowException
    {
        logger.trace( "Delete cache, store:{}, path:{}", store.getName(), path );
        if ( hosted == store.getKey().getType() )
        {
            return false;
        }
        else
        {
            return downloadManager.delete( store, path, eventMetadata );
        }
    }
clean just the cache (storage of groups and remote repos)