[AMBARI-24556] Aggregation across clusters are not being done in AMS for even when multiple cluster support is enabled. (#2314)

diff --git a/ambari-metrics-timelineservice/src/main/java/org/apache/ambari/metrics/core/timeline/aggregators/TimelineMetricClusterAggregatorSecond.java b/ambari-metrics-timelineservice/src/main/java/org/apache/ambari/metrics/core/timeline/aggregators/TimelineMetricClusterAggregatorSecond.java
index 785b416..7001aa6 100644
--- a/ambari-metrics-timelineservice/src/main/java/org/apache/ambari/metrics/core/timeline/aggregators/TimelineMetricClusterAggregatorSecond.java
+++ b/ambari-metrics-timelineservice/src/main/java/org/apache/ambari/metrics/core/timeline/aggregators/TimelineMetricClusterAggregatorSecond.java
@@ -101,9 +101,9 @@
     }
 
     if (Boolean.valueOf(metricsConf.get(TIMELINE_METRICS_SUPPORT_MULTIPLE_CLUSTERS, "false"))) {
-      this.timelineMetricReadHelper = new TimelineMetricReadHelper(metadataManager, true);
-    } else {
       this.timelineMetricReadHelper = new TimelineMetricReadHelper(metadataManager);
+    } else {
+      this.timelineMetricReadHelper = new TimelineMetricReadHelper(metadataManager, true);
     }
   }