def METHOD_NAME(apps, schema_editor):
    ticket_model = apps.get_model("tickets", "Ticket")
    tickets = ticket_model.origin_objects.all()
    for ticket in tickets:
        ticket.applicant = ticket.user
        ticket.applicant_display = ticket.user_display
        ticket.processor = ticket.assignee
        ticket.processor_display = ticket.assignee_display
        ticket.assignees_display_new = migrate_field_assignees_display(ticket.assignees_display)
        ticket.action = migrate_field_action(ticket.action, ticket.status)
        ticket.type = migrate_field_type(ticket.type)
        ticket.meta = migrate_field_meta(ticket.type, ticket.meta)
        ticket.meta['body'] = ticket.body
    fields = [
        'applicant', 'applicant_display', 'processor', 'processor_display',
        'assignees_display_new', 'action', 'type', 'meta'
    ]
    ticket_model.origin_objects.bulk_update(tickets, fields)