Change System.nanoTime to System.currentTimeMillis

Signed-off-by: Sachin Kale <[email protected]>

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

@@ -40,7 +40,6 @@
 import java.util.Optional;
 import java.util.Set;
 import java.util.TreeSet;
-import java.util.concurrent.TimeUnit;
 import java.util.function.Function;
 import java.util.stream.Collectors;
 
@@ -502,7 +501,7 @@ public static List<String> filterOutMetadataFilesBasedOnAge(
         Function<String, Long> getTimestampFunction,
         TimeValue minimumAge
     ) {
-        long maxTimestampAllowed = TimeUnit.NANOSECONDS.toMillis(System.nanoTime()) - minimumAge.getMillis();
+        long maxTimestampAllowed = System.currentTimeMillis() - minimumAge.getMillis();
         List<String> metadataFilesWithMinAge = new ArrayList<>();
         for (String metadataFileName : metadataFiles) {
             long metadataTimestamp = getTimestampFunction.apply(metadataFileName);

server/src/main/java/org/opensearch/node/remotestore/RemoteStorePinnedTimestampService.java

@@ -150,7 +150,7 @@ public void pinTimestamp(long timestamp, String pinningEntity, ActionListener<Vo
         // If a caller uses current system time to pin the timestamp, following check will almost always fail.
         // So, we allow pinning timestamp in the past upto some buffer
         long lookbackIntervalInMills = pinnedTimestampsLookbackInterval.millis();
-        if (timestamp < TimeUnit.NANOSECONDS.toMillis(System.nanoTime()) - lookbackIntervalInMills) {
+        if (timestamp < (System.currentTimeMillis() - lookbackIntervalInMills)) {
             throw new IllegalArgumentException(
                 "Timestamp to be pinned is less than current timestamp - value of cluster.remote_store.pinned_timestamps.lookback_interval"
             );