插入一个文档后显示插入成功，但是提问相关的时候，会报错，每个框内都显示error，报错如下，请问怎么解决呢？还有就是文档是纯文本即可吗？需要构建具体格式吗比如json什么的？

[adogwangwang]

Traceback (most recent call last):
File "/opt/conda/lib/python3.10/site-packages/gradio/queueing.py", line 406, in call_prediction
output = await route_utils.call_process_api(
File "/opt/conda/lib/python3.10/site-packages/gradio/route_utils.py", line 226, in call_process_api
output = await app.get_blocks().process_api(
File "/opt/conda/lib/python3.10/site-packages/gradio/blocks.py", line 1554, in process_api
result = await self.call_function(
File "/opt/conda/lib/python3.10/site-packages/gradio/blocks.py", line 1206, in call_function
prediction = await utils.async_iteration(iterator)
File "/opt/conda/lib/python3.10/site-packages/gradio/utils.py", line 517, in async_iteration
return await iterator.anext()
File "/opt/conda/lib/python3.10/site-packages/gradio/utils.py", line 510, in anext
return await anyio.to_thread.run_sync(
File "/opt/conda/lib/python3.10/site-packages/anyio/to_thread.py", line 33, in run_sync
return await get_asynclib().run_sync_in_worker_thread(
File "/opt/conda/lib/python3.10/site-packages/anyio/_backends/_asyncio.py", line 877, in run_sync_in_worker_thread
return await future
File "/opt/conda/lib/python3.10/site-packages/anyio/_backends/_asyncio.py", line 807, in run
result = context.run(func, *args)
File "/opt/conda/lib/python3.10/site-packages/gradio/utils.py", line 493, in run_sync_iterator_async
return next(iterator)
File "/opt/conda/lib/python3.10/site-packages/gradio/utils.py", line 647, in gen_wrapper
yield from f(*args, **kwargs)
File "/data/app/web.py", line 45, in predict
search_res = search_doc(question, search_method, top_k, knn_boost, threshold)
File "/data/app/web.py", line 23, in search_doc
res = es.doc_search(method=search_method, query=question, top_k=top_k, knn_boost=knn_boost)
File "/data/app/doc_search.py", line 131, in doc_search
'source': i['_source']['metadata']['source'],
KeyError: 'metadata'

[iMagist486]

#8 参考这个，检查下langchain版本；上传纯文本即可