fix: handle KeyError when accessing rules in CleanProcessor.clean (#10258)

api/core/indexing_runner.py

             rules = DatasetProcessRule.AUTOMATIC_RULES
         else:
             rules = json.loads(processing_rule.rules) if processing_rule.rules else {}
-        document_text = CleanProcessor.clean(text, rules)
+        document_text = CleanProcessor.clean(text, {"rules": rules})
 
         return document_text