Entity Framework Core add unique constraint code-first

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I can’t find way to add a unique constraint to my field with using attribute:

public class User
{
    [Required]
    public int Id { get; set; }

    [Required]
    // [Index("IX_FirstAndSecond", 2, IsUnique = true)] not supported by core
    public string Email { get; set; }

    [Required]
    public string Password { get; set; }
}

I’m using these packages:

 "Microsoft.EntityFrameworkCore": "1.0.1",
 "Microsoft.EntityFrameworkCore.SqlServer": "1.0.1",
 "Microsoft.EntityFrameworkCore.SqlServer.Design": "1.0.1",
 "Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final",

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