      validates_explain_options = False  # A query will error on invalid options.
      supports_deferrable_unique_constraints = True
      has_json_operators = True
      json_key_contains_list_matching_requires_list = True
      supports_expression_indexes = True
  
      django_test_skips = {
          'opclasses are PostgreSQL only.': {
              'indexes.tests.SchemaIndexesNotPostgreSQLTests.test_create_index_ignores_opclasses',
          },
 
</s> remove     supports_expression_indexes = True
 </s> add  </s> remove     supports_expression_indexes = False
 </s> add     supports_expression_indexes = True </s> remove     supports_expression_indexes = True
 </s> add 
      validates_explain_options = False  # A query will error on invalid options.
      supports_deferrable_unique_constraints = True
      has_json_operators = True
      json_key_contains_list_matching_requires_list = True

  
      django_test_skips = {
          'opclasses are PostgreSQL only.': {
              'indexes.tests.SchemaIndexesNotPostgreSQLTests.test_create_index_ignores_opclasses',
          },
keep keep keep keep replace keep keep keep keep keep
 Refs #26167 -- Changed default value of DatabaseFeatures.supports_expression_indexes to True. 
django/db/backends/postgresql/features.py