[Monitoring] Fix MonitoringIT on Windows

Original commit: elastic/x-pack-elasticsearch@7a835c179d

plugin/src/test/java/org/elasticsearch/xpack/monitoring/integration/MonitoringIT.java

@@ -410,7 +410,7 @@ public class MonitoringIT extends ESRestTestCase {
         assertEquals(5, source.size());
 
         final Map<String, Object> nodeStats = (Map<String, Object>) source.get(NodeStatsMonitoringDoc.TYPE);
-        assertEquals(9, nodeStats.size());
+        assertEquals(Constants.WINDOWS ? 8 : 9, nodeStats.size());
 
         NodeStatsMonitoringDoc.XCONTENT_FILTERS.forEach(filter -> {
             if (Constants.WINDOWS && filter.startsWith("node_stats.os.cpu.load_average")) {