If you want to take the Master-DB instance offline, it's important that the availability of the data is not affected. The safest way to take an existing master DB offline is to promote the existing slave to master, launch and initialize a new Slave-DB, and then safely terminate the old Master-DB.
You should only be in this situation if you need to perform an action that requires disconnecting the current Master-DB from the deployment.
Common situations are:
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