service.php

<?php

/**
 * @inheritDoc
 */
protected function renderCustomSearchView(NodeTranslation $nodeTranslation, SearchViewTemplateInterface $page) 
{
    $view = $page->getSearchView();

    $renderContext = new RenderContext([
        'locale'    => $nodeTranslation->getLang(),
        'page'      => $page,
        'indexMode' => true
    ]);
    
    if ($page instanceof PageInterface) {
        $request = $this->container->get('request_stack')->getCurrentRequest();

        $page->service($this->container, $request, $renderContext);
    }
    
    $content = $this->removeHtml($this->container->get('templating')->render($view, $renderContext->getArrayCopy()));

    return $content;
}