docs: public boolean removeStream(Stream stream) {
          final boolean removed = streams.remove(stream);
  
          if (removed) {
              indexSets.clear();
              for (Stream s : streams) {
                  indexSets.add(s.getIndexSet());
              }
              sizeCounter.dec(8);
              if (LOG.isTraceEnabled()) {
                  LOG.trace("[Message size update][{}] stream removed: {}", getId(), sizeCounter.getCount());
              }
          }
  
          return removed;
      }