Improvement on the database_convert script
Improvement on the database_convert script

1.Add "category", "ft_score", "ft_senIdex" fields to the product
documents.
2.Add a calculate_ft_dict_for_all_products function
3.upsert_review_for_product_id function no longer check for
category_name
4.Add a statistic function for obtaining statistics for the
product revies

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