[Python] ModuleNotFoundError: No module named 'haystack.document_store.elasticsearch';...

I am building a Q&A webapp with elasticsearch. I have just successfully installed farm-haystack==1.3.0 and farm with requirements.txt.

Now when I import the library, it pops up an error:

from haystack.document_store.elasticsearch import ElasticsearchDocumentStore
# from haystack.document_stores.elasticsearch import ElasticsearchDocumentStore


document_store = ElasticsearchDocumentStore(host="localhost", username="", password="", index="document")


error:

ModuleNotFoundError: No module named 'haystack.document_store.elasticsearch'; 'haystack.document_store' is not a package


It would be great if anyone can tell me how to fix it. I have made sure my haystack.document_store.elasticsearch is not document_store's'.

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