code: protected void submitSegmentIndexBuffer() {
          if(_sibEnabled && !_sib.isDirty()) {
              _sib.setSegmentId(_segment.getSegmentId());
              _sib.setSegmentLastForcedTime(_segment.getLastForcedTime());
              _segmentManager.submit(_sib);
          } else {
              _segmentManager.remove(_sib);
          }
      }
docs: Submit current segment index buffer for asynchronous handling.