public function applyDefaultSettings( &$fieldSettings )
{
    foreach ( $this->getSettingsSchema() as $settingName => $settingConfiguration )
    {
        // Checking that a default entry exists in the settingsSchema but that no value has been provided
        if ( !array_key_exists( $settingName, $fieldSettings ) && array_key_exists( "default", $settingConfiguration ) )
        {
            $fieldSettings[$settingName] = $settingConfiguration["default"];
        }
    }
}