Create a new User Pool
Use the following SQL to export from auth_user:
select username, first_name, last_name, email from auth_user where email like 'boneill%'
into outfile '/tmp/auth_user.csv' fields terminated by ',' enclosed by '"' lines terminated by '\n';
Download the header.csv: Cognito -> Manage User Pools -> Users -> Import -> Download CSV header
Run the cognito_etl script to transform the data into the respective format for Cognito.
Setup an import job Cognito -> Manage User Pools -> Users -> Import -> Create import job