[FLINK-11232][rest] Fix subtask start-time field name

flink-runtime/src/main/java/org/apache/flink/runtime/rest/messages/JobVertexDetailsInfo.java

@@ -110,7 +110,8 @@ public class JobVertexDetailsInfo implements ResponseBody {
 		public static final String FIELD_NAME_STATUS = "status";
 		public static final String FIELD_NAME_ATTEMPT = "attempt";
 		public static final String FIELD_NAME_HOST = "host";
-		public static final String FIELD_NAME_START_TIME = "start_time";
+		public static final String FIELD_NAME_START_TIME = "start-time";
+		public static final String FIELD_NAME_COMPATIBLE_START_TIME = "start_time";
 		public static final String FIELD_NAME_END_TIME = "end-time";
 		public static final String FIELD_NAME_DURATION = "duration";
 		public static final String FIELD_NAME_METRICS = "metrics";
@@ -130,6 +131,9 @@ public class JobVertexDetailsInfo implements ResponseBody {
 		@JsonProperty(FIELD_NAME_START_TIME)
 		private final long startTime;
 
+		@JsonProperty(FIELD_NAME_COMPATIBLE_START_TIME)
+		private final long startTimeCompatible;
+
 		@JsonProperty(FIELD_NAME_END_TIME)
 		private final long endTime;
 
@@ -154,6 +158,7 @@ public class JobVertexDetailsInfo implements ResponseBody {
 			this.attempt = attempt;
 			this.host = checkNotNull(host);
 			this.startTime = startTime;
+			this.startTimeCompatible = startTime;
 			this.endTime = endTime;
 			this.duration = duration;
 			this.metrics = checkNotNull(metrics);
@@ -175,6 +180,7 @@ public class JobVertexDetailsInfo implements ResponseBody {
 				attempt == that.attempt &&
 				Objects.equals(host, that.host) &&
 				startTime == that.startTime &&
+				startTimeCompatible == that.startTimeCompatible &&
 				endTime == that.endTime &&
 				duration == that.duration &&
 				Objects.equals(metrics, that.metrics);
@@ -182,7 +188,7 @@ public class JobVertexDetailsInfo implements ResponseBody {
 
 		@Override
 		public int hashCode() {
-			return Objects.hash(subtask, status, attempt, host, startTime, endTime, duration, metrics);
+			return Objects.hash(subtask, status, attempt, host, startTime, startTimeCompatible, endTime, duration, metrics);
 		}
 	}
 }