public function getFieldConfig($contentType, $field)
    {
        if (isset($this->searchableTypes[$contentType][$field])) {
            return $this->searchableTypes[$contentType][$field];
        }

        if ($this->canSearchInvisible() && isset($this->invisibleTypes[$contentType][$field])) {
            return $this->invisibleTypes[$contentType][$field];
        }

        return false;
    }