default void notifyConfigurationChanged(long term, long index, List<Peer> newConfiguration) {
      // do nothing default
    }
Notify the {@link IStateMachine} a configuration change. This method will be invoked when a
newConfiguration is processed.

@param term term of the current log entry
@param index index which is being updated
@param newConfiguration new configuration
iotdb-core/consensus/src/main/java/org/apache/iotdb/consensus/IStateMachine.java