Adjust OldCodecAvailableTests for v9 (#118510)

N-2 indices won't be covered by archive indices, but rather supported out-of-the-box.
This commit reflects that in the tests expectations and adjusts the related update for v9 annotation.

Author: javanna

x-pack/plugin/old-lucene-versions/src/test/java/org/elasticsearch/xpack/lucene/bwc/codecs/OldCodecsAvailableTests.java

@@ -8,7 +8,7 @@
 package org.elasticsearch.xpack.lucene.bwc.codecs;
 
 import org.elasticsearch.Version;
-import org.elasticsearch.core.UpdateForV9;
+import org.elasticsearch.core.UpdateForV10;
 import org.elasticsearch.test.ESTestCase;
 
 public class OldCodecsAvailableTests extends ESTestCase {
@@ -17,10 +17,8 @@ public class OldCodecsAvailableTests extends ESTestCase {
      * Reminder to add Lucene BWC codecs under {@link org.elasticsearch.xpack.lucene.bwc.codecs} whenever Elasticsearch is upgraded
      * to the next major Lucene version.
      */
-    @UpdateForV9(owner = UpdateForV9.Owner.SEARCH_FOUNDATIONS)
-    @AwaitsFix(bugUrl = "muted until we add bwc codecs to support 7.x indices in Elasticsearch 9.0")
+    @UpdateForV10(owner = UpdateForV10.Owner.SEARCH_FOUNDATIONS)
     public void testLuceneBWCCodecsAvailable() {
-        assertEquals("Add Lucene BWC codecs for Elasticsearch version 7", 8, Version.CURRENT.major);
+        assertEquals("Add Lucene BWC codecs for Elasticsearch version 7", 9, Version.CURRENT.major);
     }
-
 }