docs: protected final Iterable<ManagedIndex> getIndexes( String workspaceName ) {
          final Map<String, AtomicIndex> byIndexName = providedIndexesByIndexNameByWorkspaceName.get(workspaceName);
          if (byIndexName == null) return Collections.emptySet();
          return DelegateIterable.around(byIndexName.values(), new Function<AtomicIndex, ManagedIndex>() {
              @Override
              public ManagedIndex apply( AtomicIndex input ) {
                  return input.managed();
              }
          });
      }