test changes

Signed-off-by: Gagan Juneja <[email protected]>

src/main/java/org/opensearch/performanceanalyzer/transport/RTFPerformanceAnalyzerTransportChannel.java

@@ -91,7 +91,7 @@ private double calculateCPUUtilization(long phaseStartTime, long phaseCPUStartTi
         long totalCpuTime =
                 Math.min(0, (threadMXBean.getCurrentThreadCpuTime() - phaseCPUStartTime));
         return Utils.calculateCPUUtilization(
-                totalCpuTime, scClkTck, phaseStartTime - System.nanoTime());
+                totalCpuTime, scClkTck, System.nanoTime() - phaseStartTime);
     }
 
     @VisibleForTesting