docs: protected void waitOnDurabilityBackpressureFuture() {
          if (m_durabilityBackpressureFuture != null) {
              try {
                  m_durabilityBackpressureFuture.get();
              } catch (Throwable t) {
                  VoltDB.crashLocalVoltDB("Unexpected exception waiting for durability future", true, t);
              }
              durabilityTraceEnd();
          }
      }