class_docstr: Non permanent collection
  
  This collection is meant for debugging purposes within the EphemeralDB.
  
  .. seealso:: :class:`orion.core.io.database.ephemeraldb.EphemeralDB` for database object.
class_docstr_tok: ["Non","permanent","collection","This","collection","is","meant","for","debugging","purposes","within","the","EphemeralDB",".","..","seealso",":",":",":","class",":","`","orion.core.io.database.ephemeraldb.EphemeralDB","`","for","database","object","."]
docstr: Register index values of a new document
docstr_tok: ["Register","index","values","of","a","new","document"]
code: def _register_keys(self, document):
      """Register index values of a new document"""
      for keys, values in self._indexes.values():
          values.add(tuple(document[key] for key in keys))
  
imports: import copy
  from collections import defaultdict
  from orion.core.io.database import Database, DatabaseError, DuplicateKeyError
  from orion.core.utils.flatten import flatten, unflatten
label_desc: Use image node_id 5 for calling the EphemeralCollection obj's underlying member method code with example usage: obj._register_keys(document) without return types