docs: public boolean dispose(Long streamId) {
      boolean result = false;
      if (streamId != null) {
        Disposable disposable = subscriptions.remove(streamId);
        result = disposable != null;
        if (result) {
          LOGGER.debug("Dispose subscription by sid={}, session={}", streamId, id);
          disposable.dispose();
        }
      }
      return result;
    }