code: public static FieldFetcher fetcher(final String pathAssistantSid, 
                                         final String pathTaskSid, 
                                         final String pathSid) {
          return new FieldFetcher(pathAssistantSid, pathTaskSid, pathSid);
      }
docs: Create a FieldFetcher to execute fetch.
  
  @param pathAssistantSid The unique ID of the Assistant.
  @param pathTaskSid The unique ID of the Task associated with this Field.
  @param pathSid A 34 character string that uniquely identifies this resource.
  @return FieldFetcher capable of executing the fetch