db-authentication rolling-restart-parallel database mongo command is dependent on show database parallel-upgrade-plan. 
                                       
                                       				
                                       If show database parallel-upgrade-plan does not provide any output, then do not use db-authentication rolling-restart-parallel database mongo. Instead use db-authentication rolling-restart database mongo command.
                                       
                                       				
                                       Example: If show database parallel-upgrade-plan displays the following output:
                                       
                                       				admin@orchestrator[an-dbmaster]# show database parallel-upgrade-plan 
BATCH  MODULE          HOST            ADDRESS        
------------------------------------------------------
1      mongo-node-101  an-dbmaster     192.168.11.40  
1      mongo-node-102  an-dbcontrol-0  192.168.11.41  
1      mongo-node-103  an-dbcontrol-1  192.168.11.42  
2      mongo-node-104  an-pers-db-0    192.168.11.43  
3      mongo-node-105  an-pers-db-1    192.168.11.44  
                                       				then, db-authentication rolling-restart-parallel database mongo combines 101, 102 and 103 in batch 1 and restarts all of them at the same time.
                                       
                                       				
                                       After batch 1, node 104 from batch 2 is restarted followed by node 105 (from batch 3). So, all the nodes from same batch are
                                          restarted in parallel. However nodes from different batch are restarted in sequential manner.
                                       
                                       				
                                       A batch_interval parameter can be added as follows:
                                       				admin@orchestrator[an-master]# db-authentication rolling-restart-parallel batch_interval 8 
database mongo
                                       				where, batch_interval is an integer and accepts range between 8 to 60. By default, the value is 10. It represents the delay
                                          duration in seconds between processing of 2 subsequent batches. After executing this command, batch-wise status can be tracked
                                          using db-authentication rolling-restart-parallel-status database mongo command.