code: def get_instance(cls):
      if not cls._INSTANCE:
          cls._INSTANCE = cls()
      return cls._INSTANCE
  
imports: import logging
  import re
  from enum import Enum
  from typing import Any, Dict, List, Optional, Union
  from argilla.server.daos.backend.query_helpers import filters
  from argilla.server.daos.backend.search.model import BackendDatasetsQuery, BackendQuery, BackendRecordsQuery, BaseDatasetsQuery, QueryRange, SortableField, SortConfig
label_desc: Use image node_id 1 for calling the EsQueryBuilder obj's underlying member method code with example usage: obj.get_instance(cls) and returns: cls