code: def _index_save_path(self):
      return str(
          Path(
              self.evadb.catalog().get_configuration_catalog_value(
                  "index_dir"
              )
          )
          / Path("{}_{}.index".format("FAISS", "testCreateIndexName"))
      )
  
imports: import unittest
  from pathlib import Path
  from test.markers import macos_skip_marker
  from test.util import get_evadb_for_testing, load_functions_for_testing
  import numpy
  import pandas
  import pytest
  from evadb.catalog.catalog_type import VectorStoreType
  from evadb.executor.executor_utils import ExecutorError
  from evadb.models.storage.batch import Batch
  from evadb.server.command_handler import execute_query_fetch_all
  from evadb.storage.storage_engine import StorageEngine
  from evadb.utils.generic_utils import try_to_import_faiss
label_desc: Use image node_id 1 for calling the CreateIndexTest obj's underlying member method code with example usage: obj._index_save_path() and returns: str