Change service accounts from Domain Admin to local Admin SQL Cluster

Hi

We have some SQL Clusters in our enviroment, the previous administrator made user accounts for the sql cluster services, but he put these accounts in the Domain admins group, the security staff ask me to remove them from this group, but I don't know if this would raise issues for the SQL cluster.

I thought would be better to put this accounts in the local Administrators group in every server's cluster and remove these accounts from the Domain Admins group, but we can not restart the server....

Is this possible? or is it neccesary to do another extra procedure?

Thanks in advance.

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