public function isColumnSearchable($i, $column_search = true)
    {
        if ($column_search) {
            return
                (
                    $this->request->input("columns.$i.searchable", 'true') === 'true'
                    ||
                    $this->request->input("columns.$i.searchable", 'true') === true
                )
                && $this->columnKeyword($i) != '';
        }

        return
            $this->request->input("columns.$i.searchable", 'true') === 'true'
            ||
            $this->request->input("columns.$i.searchable", 'true') === true;
    }