add test

Signed-off-by: guojialiang <guojialiang.2012@bytedance.com>

Author: guojialiang92

server/src/test/java/org/opensearch/index/seqno/ReplicationTrackerTests.java

@@ -1870,6 +1870,8 @@ public void testSegmentReplicationCheckpointTracking() {
 
         tracker.setLatestReplicationCheckpoint(initialCheckpoint);
         tracker.startReplicationLagTimers(initialCheckpoint);
+        // test retry start replication lag timers
+        tracker.startReplicationLagTimers(initialCheckpoint);
         tracker.setLatestReplicationCheckpoint(secondCheckpoint);
         tracker.startReplicationLagTimers(secondCheckpoint);
         tracker.setLatestReplicationCheckpoint(thirdCheckpoint);