private function addSearchFields(Fieldset $fieldset)
{
$fieldset->addField('search_weight', 'select', ['name' => 'search_weight', 'label' => __('Search Weight'), 'values' => $this->weightSource->getOptions()], 'is_searchable');
$fieldset->addField('is_used_in_spellcheck', 'select', ['name' => 'is_used_in_spellcheck', 'label' => __('Used in spellcheck'), 'values' => $this->booleanSource->toOptionArray()], 'search_weight');
return $this;
}