Implements hook_entity_display_alter().
function node_entity_display_alter(EntityDisplay $display, $context) {
// Hide field labels in search index.
if ($context['entity_type'] == 'node' && $context['view_mode'] == 'search_index') {
foreach ($display
->getComponents() as $name => $options) {
if (isset($options['label'])) {
$options['label'] = 'hidden';
$display
->setComponent($name, $options);
}
}
}
}