gistfile1.txt

    public void test() throws Exception {
        File dataDir = newTempDir();
        File oldIndex = new File(getClass().getResource("index-0.20.zip").toURI());
        TestUtil.unzip(oldIndex, dataDir);
        
        
        
        NodeBuilder nodeBuilder = NodeBuilder.nodeBuilder();
        nodeBuilder.clusterName("oldindexcluster");
        Settings settings = ImmutableSettings.builder()
            .put("path.data", dataDir.getPath())
            .put("node.mode", "network")
            .put(InternalNode.HTTP_ENABLED, true)
            .build();
        Node node = nodeBuilder.settings(settings).node();
        
        try {
            node.start();
            NodeInfo info = nodeInfo(node.client());
            info.getHttp().address().boundAddress();
            TransportAddress publishAddress = info.getTransport().address().publishAddress();
            assertEquals(1, publishAddress.uniqueAddressTypeId());
            InetSocketAddress address = ((InetSocketTransportAddress) publishAddress).address();
            HttpRequestBuilder httpClient = new HttpRequestBuilder(HttpClients.createDefault()).host(address.getHostName()).port(address.getPort());
            HttpResponse rsp = httpClient.method("GET").path("/_upgrade").addParam("pretty", "true").execute();
            System.out.println("RESPONSE: \n" + rsp.getBody());
        } finally {
            node.stop();
        }
    }

    static NodeInfo nodeInfo(final Client client) {
        final NodesInfoResponse nodeInfos = client.admin().cluster().prepareNodesInfo().get();
        final NodeInfo[] nodes = nodeInfos.getNodes();
        assertEquals(1, nodes.length);
        return nodes[0];
    }