presto-elasticsearch/src/main/java/io/prestosql/elasticsearch/NodesSystemTable.java/NodesSystemTable/NodesSystemTable
class NodesSystemTable:    @Inject
    public NodesSystemTable(NodeManager nodeManager, ElasticsearchClient client)
    {
        requireNonNull(nodeManager, "nodeManager is null");

        this.client = requireNonNull(client, "client is null");
        currentNode = nodeManager.getCurrentNode();
    }