docs: public Set<String> getComponentStreams(String componentId) {
      if (outputs.containsKey(componentId)) {
        Set<String> streams = new HashSet<>();
        List<TopologyAPI.OutputStream> olist = outputs.get(componentId);
        for (TopologyAPI.OutputStream ostream : olist) {
          streams.add(ostream.getStream().getId());
        }
        return streams;
      } else {
        return null;
      }
    }