public static void onOperatorError(BiFunction<? super Throwable,Object,? extends Throwable> f){
  log.info("Hooking new default : onOperatorError");
  onOperatorErrorHook=Objects.requireNonNull(f,"onOperatorErrorHook");
}

public static void onOperatorError ( BiFunction < ? super Throwable , Object , ? extends Throwable > f ) { log . info ( "Hooking new default : onOperatorError" ) ; onOperatorErrorHook = Objects . requireNonNull ( f , "onOperatorErrorHook" ) ; }
override global operator error mapping which by default add as suppressed exception either data driven exception or error driven exception .
