Update log level to ERROR for HelixZNodeSizeLimitTest (apache#9208)

Co-authored-by: Jack Li(Analytics Engineering) <jlli@jlli-mn1.linkedin.biz>

pinot-integration-tests/src/test/java/org/apache/pinot/integration/tests/HelixZNodeSizeLimitTest.java

@@ -22,6 +22,8 @@
 import com.google.common.collect.ImmutableMap;
 import java.util.Map;
 import org.apache.helix.zookeeper.constant.ZkSystemPropertyKeys;
+import org.apache.logging.log4j.Level;
+import org.apache.logging.log4j.core.config.Configurator;
 import org.apache.pinot.common.utils.helix.HelixHelper;
 import org.apache.pinot.util.TestUtils;
 import org.testng.Assert;
@@ -45,6 +47,13 @@ public void setUp()
     // src/main/java/org/apache/helix/zookeeper/zkclient/ZkClient.java#L105
     // The below line gets executed before ZkClient.WRITE_SIZE_LIMIT is created
     System.setProperty(ZkSystemPropertyKeys.JUTE_MAXBUFFER, "4000000");
+
+    // Set log level to ERROR, as there are too many warning messages printed if warn level is used like below:
+    //   20:07:11.616 WARN [TopStateHandoffReportStage] [HelixController-pipeline-default-HelixZNodeSizeLimitTest
+    //   -(b90d2ed3_DEFAULT)] Event b90d2ed3_DEFAULT : Cannot confirm top state missing start time.
+    //   Use the current system time as the start time.
+    Configurator.setAllLevels("", Level.ERROR);
+
     TestUtils.ensureDirectoriesExistAndEmpty(_tempDir);
 
     // Start Zookeeper
@@ -63,6 +72,9 @@ public void tearDown()
     stopBroker();
     stopController();
     stopZk();
+
+    // Reset log level back to warn.
+    Configurator.setAllLevels("", Level.WARN);
   }
 
   @Test