Refs #27064 -- Made migrations generate RenameIndex operations when renaming Meta.indexes.

tests/migrations/test_autodetector.py

@@ -2565,6 +2565,39 @@ class AutodetectorTests(TestCase):
             changes, "otherapp", 0, 0, model_name="book", name="book_title_author_idx"
         )
 
+    def test_rename_indexes(self):
+        book_renamed_indexes = ModelState(
+            "otherapp",
+            "Book",
+            [
+                ("id", models.AutoField(primary_key=True)),
+                ("author", models.ForeignKey("testapp.Author", models.CASCADE)),
+                ("title", models.CharField(max_length=200)),
+            ],
+            {
+                "indexes": [
+                    models.Index(
+                        fields=["author", "title"], name="renamed_book_title_author_idx"
+                    )
+                ],
+            },
+        )
+        changes = self.get_changes(
+            [self.author_empty, self.book_indexes],
+            [self.author_empty, book_renamed_indexes],
+        )
+        self.assertNumberMigrations(changes, "otherapp", 1)
+        self.assertOperationTypes(changes, "otherapp", 0, ["RenameIndex"])
+        self.assertOperationAttributes(
+            changes,
+            "otherapp",
+            0,
+            0,
+            model_name="book",
+            new_name="renamed_book_title_author_idx",
+            old_name="book_title_author_idx",
+        )
+
     def test_order_fields_indexes(self):
         """Test change detection of reordering of fields in indexes."""
         changes = self.get_changes(