Change domain controller for Exchange server 2013

Hi all,

My environment : 2 Exchange server 2013 CU19 (both CAS + Mailbox roles) Windows server 2008 R2 Enterprise, Domain controller Windows server 2008 R2 Enterprise .
I added 1 more new Windows server 2012 R2 Standard into my domain and promoted it to Domain Controller.
I attempt to transfer 5 FSMO roles from Windows server 2008 R2 to Windows server 2012 R2 later, demote old server 2008 R2 and remove it from my environment later.

Here some information about 2 Exchange servers :

[PS] C:\Windows\system32>Get-ExchangeServer -Identity "exchangeserver1" -status | Select-Object Name,StaticDomainControllers,S
taticGlobalCatalogs,StaticConfigDomainController,StaticExcludedDomainControllers,CurrentDomainControllers,CurrentGlobalC
atalogs,CurrentConfigDomainController,OriginatingServer


Name                            : exchangeserver1
StaticDomainControllers         : {}
StaticGlobalCatalogs            : {}
StaticConfigDomainController    :
StaticExcludedDomainControllers : {}
CurrentDomainControllers        : {server2008r2.mydomain.com, server2012r2.mydomain.com}
CurrentGlobalCatalogs           : {server2008r2.mydomain.com, server2012r2.mydomain.com}
CurrentConfigDomainController   : server2008r2.mydomain.com
OriginatingServer               : server2008r2.mydomain.com

[PS] C:\Windows\system32>Get-ExchangeServer -Identity "exchangeserver2" -status | Select-Object Name,StaticDomainControllers,S
taticGlobalCatalogs,StaticConfigDomainController,StaticExcludedDomainControllers,CurrentDomainControllers,CurrentGlobalC
atalogs,CurrentConfigDomainController,OriginatingServer


Name                            : exchangeserver2
StaticDomainControllers         : {}
StaticGlobalCatalogs            : {}
StaticConfigDomainController    :
StaticExcludedDomainControllers : {}
CurrentDomainControllers        : {server2008r2.mydomain.com, server2012r2.mydomain.com}
CurrentGlobalCatalogs           : {server2008r2.mydomain.com, server2012r2.mydomain.com}
CurrentConfigDomainController   : server2008r2.mydomain.com
OriginatingServer               : server2008r2.mydomain.com

[PS] C:\Windows\system32>Get-AdServerSettings

ConfigurationDomainCont PreferredDomainControll PreferredGlobalCatalog  RecipientViewRoot       ViewEntireForest
roller                  ers
----------------------- ----------------------- ----------------------  -----------------       ----------------
                        {}                                              mydomain.com                 False

So what I need to do to change domain controller for 2 Exchange server ? For ex

Set-ExchangeServer -identity "exchangeserver1" -StaticDomainControllers "server2012r2.mydomain.com" -StaticGlobalCatalogs "server2012r2.mydomain.com"

Set-ExchangeServer -identity "exchangeserver2" -StaticDomainControllers "server2012r2.mydomain.com" -StaticGlobalCatalogs "server2012r2.mydomain.com"

Please give me some advice, thank you very much.