private void startActiveMiningCoordinator() {
    activeMiningCoordinator.enable();
    activeMiningCoordinator.start();
    if (activeMiningCoordinator instanceof BlockAddedObserver) {
      ((BlockAddedObserver) activeMiningCoordinator).removeObserver();
    }
  }
Instantiates a new Migrating mining coordinator.

@param miningCoordinatorSchedule the mining coordinator schedule
@param blockchain the blockchain
consensus/common/src/main/java/org/hyperledger/besu/consensus/common/MigratingMiningCoordinator.java