replace the entire book body

            Instead of `update_book` this function
            will overwrite the book content with param body

            If param `version` is given, it will be checked that the
            changes are applied upon that document version.
            If the document version provided is different from the one actually found,
            an `elasticsearch.ConflictError` will be raised

def modify_book(self, id, body, doc_type='book', version=None):
        ''' replace the entire book body

            Instead of `update_book` this function
            will overwrite the book content with param body

            If param `version` is given, it will be checked that the
            changes are applied upon that document version.
            If the document version provided is different from the one actually found,
            an `elasticsearch.ConflictError` will be raised
        '''
        validatedBody = validate_book(body)
        params = dict(index=self.index_name, id=id, doc_type=doc_type, body=validatedBody)
        if version:
            params['version'] = version
        ret = self.es.index(**params)
        return ret