protected function getIndexingConfigurationSelector()
{
$selectorMarkup = 'Please select a site first.';
$this->schedulerModule->doc->getPageRenderer()->addCssFile('../typo3conf/ext/solr/Resources/Css/Backend/indexingconfigurationselectorfield.css');
if (!is_null($this->site)) {
$selectorField = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance('Tx_Solr_Backend_IndexingConfigurationSelectorField', $this->site);
$selectorField->setFormElementName('tx_scheduler[indexingConfigurations]');
$selectorField->setSelectedValues($this->task->getIndexingConfigurationsToReIndex());
$selectorMarkup = $selectorField->render();
}
return $selectorMarkup;
}