changed max token size to 500

utils/haystack.py

@@ -100,7 +100,8 @@ def start_haystack_extractive(_document_store: BaseDocumentStore, _retriever: Em
 def start_haystack_rag(_document_store: BaseDocumentStore, _retriever: EmbeddingRetriever, openai_key):
     prompt_node = PromptNode(default_prompt_template="deepset/question-answering", 
                              model_name_or_path=model_configs['GENERATIVE_MODEL'],
-                             api_key=openai_key)
+                             api_key=openai_key,
+                             max_length=500)
     pipe = Pipeline()
 
     pipe.add_node(component=_retriever, name="Retriever", inputs=["Query"])