Change snapshot entity delimiter while pinning the timestamp

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

Author: Sachin Kale

server/src/main/java/org/opensearch/snapshots/SnapshotsService.java

@@ -216,7 +216,7 @@ public class SnapshotsService extends AbstractLifecycleComponent implements Clus
         Setting.Property.Dynamic
     );
 
-    private static final String SNAPSHOT_PINNED_TIMESTAMP_DELIMITER = ":";
+    private static final String SNAPSHOT_PINNED_TIMESTAMP_DELIMITER = "__";
     private volatile int maxConcurrentOperations;
 
     public SnapshotsService(

test/framework/src/main/java/org/opensearch/test/OpenSearchIntegTestCase.java

@@ -2886,7 +2886,7 @@ private static Settings buildRemoteStoreNodeAttributes(
         }
         settings.put(RemoteStoreSettings.CLUSTER_REMOTE_STORE_PATH_TYPE_SETTING.getKey(), randomFrom(PathType.values()));
         settings.put(RemoteStoreSettings.CLUSTER_REMOTE_STORE_TRANSLOG_METADATA.getKey(), randomBoolean());
-        settings.put(RemoteStoreSettings.CLUSTER_REMOTE_STORE_PINNED_TIMESTAMP_ENABLED.getKey(), false);
+        settings.put(RemoteStoreSettings.CLUSTER_REMOTE_STORE_PINNED_TIMESTAMP_ENABLED.getKey(), randomBoolean());
         return settings.build();
     }