Acquire seacher on closing engine should throw ACE (#33331)

Closes #33330

server/src/main/java/org/elasticsearch/index/engine/InternalEngine.java

@@ -2014,7 +2014,9 @@ public class InternalEngine extends Engine {
         /* Acquire order here is store -> manager since we need
          * to make sure that the store is not closed before
          * the searcher is acquired. */
-        store.incRef();
+        if (store.tryIncRef() == false) {
+            throw new AlreadyClosedException(shardId + " store is closed", failedEngine.get());
+        }
         Releasable releasable = store::decRef;
         try {
             final ReferenceManager<IndexSearcher> referenceManager;

server/src/test/java/org/elasticsearch/index/engine/InternalEngineTests.java

@@ -5020,6 +5020,11 @@ public class InternalEngineTests extends EngineTestCase {
         assertThat(engine.lastRefreshedCheckpoint(), equalTo(engine.getLocalCheckpoint()));
     }
 
+    public void testAcquireSearcherOnClosingEngine() throws Exception {
+        engine.close();
+        expectThrows(AlreadyClosedException.class, () -> engine.acquireSearcher("test"));
+    }
+
     private static void trimUnsafeCommits(EngineConfig config) throws IOException {
         final Store store = config.getStore();
         final TranslogConfig translogConfig = config.getTranslogConfig();

server/src/test/java/org/elasticsearch/index/shard/PrimaryReplicaSyncerTests.java

@@ -125,7 +125,6 @@ public class PrimaryReplicaSyncerTests extends IndexShardTestCase {
         closeShards(shard);
     }
 
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/33330")
     public void testSyncerOnClosingShard() throws Exception {
         IndexShard shard = newStartedShard(true);
         AtomicBoolean syncActionCalled = new AtomicBoolean();