Capitalize action name

rest_framework/schemas/openapi.py

@@ -107,7 +107,7 @@ def _get_operation_id(self, path, method):
         if is_list_view(path, method, self.view):
             action = 'List'
         elif method_name not in self.method_mapping:
-            action = method_name
+            action = method_name.capitalize()
         else:
             action = self.method_mapping[method.lower()]