YARN-11764. Fix CheckStyle.

Author: fanshilun

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-api/src/main/java/org/apache/hadoop/yarn/api/records/timeline/TimelineEntity.java

@@ -55,8 +55,8 @@
 @XmlAccessorType(XmlAccessType.NONE)
 @Public
 @Evolving
-//@JsonIgnoreProperties(ignoreUnknown = true,
-//    value = {"relatedEntitiesJAXB", "primaryFiltersJAXB", "otherInfoJAXB"})
+@JsonIgnoreProperties(ignoreUnknown = true,
+    value = {"relatedEntitiesJAXB", "primaryFiltersJAXB", "otherInfoJAXB"})
 public class TimelineEntity implements Comparable<TimelineEntity> {
 
   private String entityType;