fix precommit failure

Signed-off-by: Anshu Agarwal <anshukag@amazon.com>

Author: Anshu Agarwal

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

@@ -12,6 +12,7 @@
 import org.apache.logging.log4j.Logger;
 import org.apache.logging.log4j.message.ParameterizedMessage;
 import org.opensearch.cluster.service.ClusterService;
+import org.opensearch.common.annotation.ExperimentalApi;
 import org.opensearch.common.blobstore.BlobContainer;
 import org.opensearch.common.blobstore.BlobMetadata;
 import org.opensearch.common.collect.Tuple;
@@ -42,6 +43,7 @@
  *
  * @opensearch.internal
  */
+@ExperimentalApi
 public class RemoteStorePinnedTimestampService implements Closeable {
     private static final Logger logger = LogManager.getLogger(RemoteStorePinnedTimestampService.class);
     private static Tuple<Long, Set<Long>> pinnedTimestampsSet = new Tuple<>(-1L, Set.of());