code: func NewAllocateReplicaAllocationCommand(index string, shardId int, node string) *AllocateReplicaAllocationCommand {
  	return &AllocateReplicaAllocationCommand{
  		index:   index,
  		shardId: shardId,
  		node:    node,
  	}
  }
docs: // NewAllocateReplicaAllocationCommand creates a new
  // AllocateReplicaAllocationCommand.