Important: This breaks backwards compatibility with 0.90
* Removed endpoints: /_cluster/nodes, /_cluster/nodes/nodeId1,nodeId2
* Disallow usage of parameters, but make required metrics part of URI
* Changed NodesInfoRequest to return everything by default
* Fixed NPE in NodesInfoResponse
Closes#4055
This reverts commit 04134492cc2bc8656512288b0127b4658b739c3e.
We should only support one path but we should still maintain the full
spec in the json file.