Can we search the answer if we did not select index in Elasticsearch?

[laifuchicago]

To: Writer
In previous version, inference.py we can left index part blank just like:
document_store = ElasticsearchDocumentStore(host="localhost", username="", password="", index="")
But in the latest version, if we left it blank, it would show:

Traceback (most recent call last):

File "inference2.py", line 42, in
document_store = ElasticsearchDocumentStore(host="172.18.0.3", username="", password="", index="")
File "/workspace/haystack/haystack/database/elasticsearch.py", line 49, in init
self.client.indices.create(index=index, ignore=400, body=custom_mapping)
File "/root/.local/lib/python3.6/site-packages/elasticsearch/client/utils.py", line 92, in _wrapped
return func(*args, params=params, headers=headers, **kwargs)
File "/root/.local/lib/python3.6/site-packages/elasticsearch/client/indices.py", line 101, in create
raise ValueError("Empty value passed for a required argument 'index'.")
ValueError: Empty value passed for a required argument 'index'.

Can you please help, thanks.