[Remote Store] Add check for byte lag in time lag calculation

Signed-off-by: Ashish Singh <[email protected]>

server/src/main/java/org/opensearch/index/remote/RemoteSegmentTransferTracker.java

@@ -260,7 +260,7 @@ public long getRefreshSeqNoLag() {
     }
 
     public long getTimeMsLag() {
-        if (remoteRefreshTimeMs == localRefreshTimeMs) {
+        if (remoteRefreshTimeMs == localRefreshTimeMs || bytesLag == 0) {
             return 0;
         }
         return currentTimeMsUsingSystemNanos() - remoteRefreshStartTimeMs;