ConjunctionValidator

public function initializeCreateAction() {
    if ($this->arguments->hasArgument('newModel')) {
        // \TYPO3\CMS\Extbase\Validation\Validator\ConjunctionValidator 
        $conjunctionValidator = $this->arguments->getArgument('newModel')->getValidator();
        foreach ($conjunctionValidator->getValidators() as $validator) {
            $conjunctionValidator->removeValidator($validator);
        }
    }
}