book_doc = self.create_book_doc(book)
meta_fields = self.extract_metadata(book, book_info, dc_only=['source_name', 'authors', 'title'])
# let's not index it - it's only used for extracting publish date
book_doc = self.create_book_doc(book)
meta_fields = self.extract_metadata(book, book_info, dc_only=['source_name', 'authors', 'title'])
# let's not index it - it's only used for extracting publish date