TypeError: __init__() missing 1 required positional argument: 'content'

Question

I am using Haystack for searching query when i write documents in document store, Unfortunately This error occurred for me. Here is my code:

if __name__ == "__main__":
    document_store = ElasticsearchDocumentStore(
        host='localhost',
        username='', password='',
        index='aurelius'
    )
    df = pd.read_csv('news.csv')
    print(df.columns)
    data_json = [{
        'text': text,
        'meta': {
            'source': 'news'
        }
    } for text in df['Text'].values]
    document_store.write_documents(data_json)
    retriever_elastic = DensePassageRetriever(
        document_store=document_store,
        query_embedding_model='facebook/dpr-question_encoder-single-nq-base',
        passage_embedding_model='facebook/dpr-ctx_encoder-single-nq-base',
        embed_title=True
    )
    document_store.update_embeddings(retriever=retriever_elastic)
    print(retriever_elastic.retrieve("german business confidence slides german business confidence fell in february knocking hopes of a speedy recovery in europe s largest economy. "))

Answer 1

Based on @UninformedUser reply.

I assume that it is the document.store.write_documents(data_json) that throws the exception. As the format for the argument has been changed from { 'text': str, 'meta': obj} to {'content': str, 'meta': obj}.

So basically you only need to fix the list comprehension part of your code:

data_json = [{
    'content': text,
    'meta': {
        'source': 'news'
    }
} for text in df['Text'].values]
document_store.write_documents(data_json)