code: def values_es(es):
      es.normalize_dataframe(
          "log",
          "values",
          "value",
          make_time_index=True,
          new_dataframe_time_index="value_time",
      )
      return es
  
imports: from datetime import datetime
  import pandas
  import pytest
  from woodwork.logical_types import Categorical, Datetime, Integer
  from featuretools.entityset.entityset import LTI_COLUMN_NAME
  from featuretools.tests.testing_utils import to_pandas
  from featuretools.utils.gen_utils import Library, import_or_none
label_desc: Use image node_id 1 for calling a global function with example usage: values_es(es) and returns: es