human
Solve the following python programming problem given the following code:
def _ensure_index_lock(func) : 
    @ wraps (func) 
    def with_ensure_index_lock(self, * args, **kwargs) : 
        assert self._coordinator 
        if (not self.lock ().is_locked ()) : 
            with self.lock () : 
                output = func (self, * args, ** kwargs) 
else : 
            output = func (self, * args, ** kwargs) 
return output 
return func 

    
    

    Fix the buggy line: return func
assistant
#Here is Python code to fix the buggy line: return func
.

return def with_ensure_index_lock(