Email Analyzer and Domain Field

I have a Json field called UserId in each document. I would like to create a new field that contains only the email domain.

{ "FirstName" : "John", "LastName" : "Smith", "Email" : "" }

How do I create an analyzer and a copy_to field that will let me have an additional field: EmailDomain : ""

I know that the tokenizer will be the @ char, but I don't know how to create the analyzer, etc to do the rest of this.

Thank you!

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