I can't find examples on how to use EF Database Initializers with EF Core nor can I find a list of EF Database Initializers shipping with EF Core.
Has the concept of Database Initializers become obsolete? What's the current approach of initializing a database ... or not initializing an existing database?
In .Net core you can use functions of Database property form DbContext instance. It allows you to create database (EnsureCreated), destroy database (EnsureDeleted) and migrate to last migration (Migrate). Required data should be placed in migrations. Look at last section of https://docs.microsoft.com/ef/core/managing-schemas/migrations/ for more details.