code: def _CollectHistoryAgg_(contactHist, fieldHistObj, fieldName):
      
  
      if fieldHistObj!={}:
          if fieldName not in contactHist.keys():
              contactHist[fieldName] = {}
          for lookupType in fieldHistObj.keys():
              contactHist[fieldName][lookupType] = fieldHistObj[lookupType]
  
      return contactHist
docs: Return updated history dictionary with new field change
  
      :param dict contactHist: Existing contact history dictionary
      :param dict fieldHistObj: Output of _CollectHistory_
      :param string fieldName: field name