Sanitize debug var= tasks of the loop variable

changelogs/fragments/66269-hide-debug-loop-vars.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - "Fixed it so that debug tasks using var option will no longer show loop control variables."

lib/ansible/plugins/callback/__init__.py

@@ -269,6 +269,11 @@ class CallbackBase(AnsiblePlugin):
                 # 'var' value as field, so eliminate others and what is left should be varname
                 for hidme in self._hide_in_debug:
                     result.pop(hidme, None)
+                # when using loop control, remove these vars in addition to the var they reference
+                for control_var in ('ansible_loop_var', 'ansible_index_var'):
+                    if control_var in result:
+                        loop_var = result.pop(control_var)
+                        result.pop(loop_var, None)
 
     def _print_task_path(self, task, color=C.COLOR_DEBUG):
         path = task.get_path()