Destroy the index. Don't use this Index object anymore after this
        call. Index will have to be rebuilt from scratch

def destroy_index(self):
        """
        Destroy the index. Don't use this Index object anymore after this
        call. Index will have to be rebuilt from scratch
        """
        self.close()
        logger.info("Destroying the index ...")
        rm_rf(self.indexdir)
        rm_rf(self.label_guesser_dir)
        logger.info("Done")