Reintroduce non-semantic version in NodeInfo (revert #102636)

Kibana has updated its codebase to handle non-semver (elastic/kibana#172093), so we can now safely reintroduce our change.

Author: ldematte

server/src/main/java/org/elasticsearch/node/NodeService.java

@@ -10,7 +10,6 @@
 
 import org.elasticsearch.Build;
 import org.elasticsearch.TransportVersion;
-import org.elasticsearch.Version;
 import org.elasticsearch.action.admin.cluster.node.info.ComponentVersionNumber;
 import org.elasticsearch.action.admin.cluster.node.info.NodeInfo;
 import org.elasticsearch.action.admin.cluster.node.stats.NodeStats;
@@ -120,8 +119,7 @@ public NodeInfo info(
         boolean indices
     ) {
         return new NodeInfo(
-            // TODO: revert to Build.current().version() when Kibana is updated
-            Version.CURRENT.toString(),
+            Build.current().version(),
             TransportVersion.current(),
             IndexVersion.current(),
             componentVersions,