class_docstr: Indexer mixin
  
  Mixin for handling indexers.
  
  .. note::
     To use this mixin the instance inheriting it must set the
      ``indexer`` or ``indexers`` attribute in ``__init__`` (not both).
code: def _setup_0_index(self, X, y, job):
      indexers = self._get_indexers()
      for indexer in indexers:
          indexer.fit(X, y, job)
  
imports: import warnings
  from abc import abstractmethod
  import numpy
  from ._base_functions import check_stack, check_params
  from ..None import config
  from ..utils.exceptions import ParallelProcessingError
  from ..externals.sklearn.base import clone, BaseEstimator
label_desc: Use image node_id 4 for calling the IndexMixin obj's underlying member method code with example usage: obj._setup_0_index(X, y, job) without return types