Sending request to http://localhost:8181/restconf/config/opendaylight-inventory:nodes/node/2 with data:
{
"id": 1
}

Returns response 204 No Content

And GET on URI http://localhost:8181/restconf/config/opendaylight-inventory:nodes returns data:
{
"nodes": {
"node": [

{ "id": "2" }

]
}
}

I'm not sure if this is expected behaviour?