code: def flush(self, save_index=False, save_model=False, clear_buffer=False):
          
          if save_index:
              if self.fresh_index is not None:
                  self.fresh_index.save(self.location('index_fresh'))
              if self.opt_index is not None:
                  self.opt_index.save(self.location('index_opt'))
          if save_model:
              if self.model is not None:
                  self.model.save(self.location('model'))
          self.payload.commit()
          if clear_buffer:
              if hasattr(self, 'fresh_docs'):
                  try:
                      self.fresh_docs.terminate() # erase all buffered documents + file on disk
                  except:
                      pass
              self.fresh_docs = SqliteDict(journal_mode=JOURNAL_MODE) # buffer defaults to a random location in temp
          self.fresh_docs.sync()
docs: Commit all changes, clear all caches.