  from django.db.models.fields.json import KeyTextTransform
  from django.db.models.functions import Abs, Cast, Collate, Lower, Random, Upper
  from django.db.models.indexes import IndexExpression
  from django.db.transaction import TransactionManagementError, atomic
  from django.test import TransactionTestCase, skipIfDBFeature, skipUnlessDBFeature
  from django.test.utils import CaptureQueriesContext, isolate_apps, register_lookup
  
  from .fields import CustomManyToManyField, InheritedManyToManyField, MediumBlobField
  from .models import (
      Author,
 
</s> remove from django.test import SimpleTestCase, override_settings
 </s> add from django.test import SimpleTestCase, ignore_warnings, override_settings
from django.test import (
    TransactionTestCase,
    ignore_warnings,
    skipIfDBFeature,
    skipUnlessDBFeature,
)
  from django.db.models.fields.json import KeyTextTransform
  from django.db.models.functions import Abs, Cast, Collate, Lower, Random, Upper
  from django.db.models.indexes import IndexExpression
  from django.db.transaction import TransactionManagementError, atomic
from django.test import (
    TransactionTestCase,
    ignore_warnings,
    skipIfDBFeature,
    skipUnlessDBFeature,
)
  from django.test.utils import CaptureQueriesContext, isolate_apps, register_lookup
  
  from .fields import CustomManyToManyField, InheritedManyToManyField, MediumBlobField
  from .models import (
      Author,
keep keep keep keep replace keep keep keep keep keep
 Fixed #27236 -- Deprecated Meta.index_together in favor of Meta.indexes.

This also deprecates AlterIndexTogether migration operation. 
tests/schema/tests.py