Use select to True on create_date

If the index is created only in __register__ then it is dropped before being
created again.

issue11197
review389881002

invoice.py

@@ -266,6 +266,7 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin):
     @classmethod
     def __setup__(cls):
         super(Invoice, cls).__setup__()
+        cls.create_date.select = True
         cls._check_modify_exclude = {
             'state', 'payment_lines', 'move', 'cancel_move',
             'additional_moves', 'invoice_report_cache',
@@ -410,9 +411,6 @@ class Invoice(Workflow, ModelSQL, ModelView, TaxableMixin):
         # Migration from 4.0: Drop not null on payment_term
         table.not_null_action('payment_term', 'remove')
 
-        # Add index on create_date
-        table.index_action('create_date', action='add')
-
         # Migration from 5.6: rename state cancel to cancelled
         cursor.execute(*sql_table.update(
                 [sql_table.state], ['cancelled'],