code: def drop_data_index(self) -> None:
      for key in self.data_index.ls((), detail=False):
          try:
              self.data_index.delete_node(key)
          except KeyError:
              pass
      self.data_index.commit()
      self.data_index.close()
      self._reset()
  
imports: import os
  from collections import defaultdict
  from contextlib import contextmanager
  from functools import wraps
  from typing import TYPE_CHECKING, Callable, ContextManager, Iterable, Optional, Tuple, Union
  from dvc.exceptions import DvcException, NotDvcRepoError, OutputNotFoundError, RevCollectionError
  from dvc.ignore import DvcIgnoreFilter
  from dvc.log import logger
  from dvc.utils.objects import cached_property
label_desc: Use image node_id 18 for calling the Repo obj's underlying member method code with example usage: obj.drop_data_index() without return types