Defuse timebomb

Author: DaveCTurner

server/src/main/java/org/elasticsearch/index/seqno/ReplicationTracker.java

@@ -331,7 +331,7 @@ public synchronized void updateRetentionLeasesOnReplica(final RetentionLeases re
     public RetentionLeases loadRetentionLeases(final Path path) throws IOException {
         final RetentionLeases retentionLeases = RetentionLeases.FORMAT.loadLatestState(logger, NamedXContentRegistry.EMPTY, path);
         if (retentionLeases == null) {
-            if (Version.CURRENT.major == 8) { // TODO remove this after backporting
+            if (8 <= Version.CURRENT.major) { // TODO remove this after backporting
                 throw new IllegalStateException("no retention leases file found");
             } else {
                 // upgrading from a 6.x version in which no retention leases were persisted