Mute testFilterCacheStats

Tracked at #32506

server/src/test/java/org/elasticsearch/indices/stats/IndexStatsIT.java

@@ -1004,6 +1004,7 @@ public class IndexStatsIT extends ESIntegTestCase {
         assertEquals(total, shardTotal);
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/32506")
     public void testFilterCacheStats() throws Exception {
         assertAcked(prepareCreate("index").setSettings(Settings.builder().put(indexSettings()).put("number_of_replicas", 0).build()).get());
         indexRandom(true,