Will my Mac automatically stop using wifi when connected to an Ethernet enabled thunderbolt display?

Will my 2012 Macbook pro retina  automatically stop using wifi when connected to an Ethernet enabled thunderbolt display?

Depends.
If you go in System Preferences / Network, you will see a list of all the network interfaces your current configuration has. If you click on the gear icon next to the minus sign, the drop menu will offer "Set Service Order...". There you can prioritize the order of use: Ethernet above Wi-Fi and wireless will be ignored if Ethernet is available.
Note that the Wi-Fi card will remain active and associated with an access point nonetheless. It just won't be used for communications by the OS and apps.

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