Elasticsearch: TransportProxyClient throws NPE on execute with null proxy

[itonics-tbeauvais]

Elasticsearch version:
2.4.0

Plugins installed: [
carrot2/elasticsearch-carrot2: 2.4.0.1
]

JVM version:
1.8

OS version:
Ubuntu 14.04

Description of the problem including expected versus actual behavior:
When issuing a request via the Java API, the "proxy" is null: TransportProxyClient@55

You can find more information that I filled with the plugin provider, though this is a general elastic problem. Any insight would be great!

Provide logs (if relevant):
https://github.com/carrot2/elasticsearch-carrot2/issues/52

[itonics-tbeauvais]

I figured out the problem.

I had to add the plugin to the TransportClient. Can someone tell me why I have to do this? Why doesn't the TransportClient know that the server has this plugin installed? When I look at the node info without the added the plugin, it's there. I am really confused.

return instance = TransportClient
                .builder()
                .addPlugin(ClusteringPlugin.class)
                .settings(settings)
                .build()
                .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9300));

[s1monw]

Why doesn't the TransportClient know that the server has this plugin installed

42 - I mean how would that work we look at the server and then load a class dynamically? You have to install all plugins that you need on the client and the server. The plugin might contain transport protocol classes that you need to serialize / deserialize things so you need it on both ends.

[itonics-tbeauvais]

Thanks! That makes sense. I just didn't have to do that in previous version of elasticsearch. I would think that the plugin would register itself. I'll talk with the plugin developer. Cheers!

[dweiss]

The plugin registers itself if you run the full ES node (because ES scans for plugins and loads them), but not if you create a transport client from your code and then try to connect to a remote instance -- then you have to register the code that contain plugin's transport classes.