public function getSchemaIndexes($conn = null)
    {
        $indx = [];
        $labels = $this->getLabels($conn)->getBody();
        foreach ($labels as $label) {
            $indexes = $this->listIndex($label, $conn)->getBody();
            foreach ($indexes as $property) {
                $indx[] = new Index($label, $property);
            }
        }

        return $indx;
    }