def index_information(self, session=None):
        """Get information on this collection's indexes.

        Returns a dictionary where the keys are index names (as
        returned by create_index()) and the values are dictionaries
        containing information about each index. The dictionary is
        guaranteed to contain at least a single key, ``"key"`` which
        is a list of (key, direction) pairs specifying the index (as
        passed to create_index()). It will also contain any other
        metadata about the indexes, except for the ``"ns"`` and
        ``"name"`` keys, which are cleaned. Example output might look
        like this:

        >>> db.test.create_index("x", unique=True)
        u'x_1'
        >>> db.test.index_information()
        {u'_id_': {u'key': [(u'_id', 1)]},
         u'x_1': {u'unique': True, u'key': [(u'x', 1)]}}

        :Parameters:
          - `session` (optional): a
            :class:`~pymongo.client_session.ClientSession`.

        .. versionchanged:: 3.6
           Added ``session`` parameter.
        """
        cursor = self.list_indexes(session=session)
        info = {}
        for index in cursor:
            index["key"] = index["key"].items()
            index = dict(index)
            info[index.pop("name")] = index
        return info
Get information on this collection's indexes.

        Returns a dictionary where the keys are index names (as
        returned by create_index()) and the values are dictionaries
        containing information about each index. The dictionary is
        guaranteed to contain at least a single key, ``"key"`` which
        is a list of (key, direction) pairs specifying the index (as
        passed to create_index()). It will also contain any other
        metadata about the indexes, except for the ``"ns"`` and
        ``"name"`` keys, which are cleaned. Example output might look
        like this:

        >>> db.test.create_index("x", unique=True)
        u'x_1'
        >>> db.test.index_information()
        {u'_id_': {u'key': [(u'_id', 1)]},
         u'x_1': {u'unique': True, u'key': [(u'x', 1)]}}

        :Parameters:
          - `session` (optional): a
            :class:`~pymongo.client_session.ClientSession`.

        .. versionchanged:: 3.6
           Added ``session`` parameter.
        
stackoverflow/venv/lib/python3.6/site-packages/pymongo/collection.py