Refs #27064 -- Added RenameIndex migration operation.

docs/ref/migration-operations.txt

@@ -222,6 +222,22 @@ Creates an index in the database table for the model with ``model_name``.
 
 Removes the index named ``name`` from the model with ``model_name``.
 
+``RenameIndex``
+---------------
+
+.. versionadded:: 4.1
+
+.. class:: RenameIndex(model_name, new_name, old_name=None, old_fields=None)
+
+Renames an index in the database table for the model with ``model_name``.
+Exactly one of ``old_name`` and ``old_fields`` can be provided. ``old_fields``
+is an iterable of the strings, often corresponding to fields of
+:attr:`~django.db.models.Options.index_together`.
+
+On databases that don't support an index renaming statement (SQLite and MariaDB
+< 10.5.2), the operation will drop and recreate the index, which can be
+expensive.
+
 ``AddConstraint``
 -----------------
 

docs/ref/schema-editor.txt

@@ -79,6 +79,15 @@ Adds ``index`` to ``model``’s table.
 
 Removes ``index`` from ``model``’s table.
 
+``rename_index()``
+------------------
+
+.. versionadded:: 4.1
+
+.. method:: BaseDatabaseSchemaEditor.rename_index(model, old_index, new_index)
+
+Renames ``old_index`` from ``model``’s table to ``new_index``.
+
 ``add_constraint()``
 --------------------
 

docs/releases/4.1.txt

@@ -342,7 +342,10 @@ Management Commands
 Migrations
 ~~~~~~~~~~
 
-* ...
+* The new :class:`~django.db.migrations.operations.RenameIndex` operation
+  allows renaming indexes defined in the
+  :attr:`Meta.indexes <django.db.models.Options.indexes>` or
+  :attr:`~django.db.models.Options.index_together` options.
 
 Models
 ~~~~~~