Adjust FieldUsageStatsIT following removal of LeafSimScorer

This is a leftover after adapting to the removal of LeafSimScorer

Relates to apache/lucene#13957

Author: javanna

server/src/internalClusterTest/java/org/elasticsearch/search/stats/FieldUsageStatsIT.java

@@ -105,7 +105,7 @@ public void testFieldUsageStats() throws ExecutionException, InterruptedExceptio
         assertTrue(stats.hasField("field2"));
         // positions because of span query
         assertEquals(
-            Set.of(UsageContext.TERMS, UsageContext.POSTINGS, UsageContext.FREQS, UsageContext.POSITIONS),
+            Set.of(UsageContext.TERMS, UsageContext.POSTINGS, UsageContext.FREQS, UsageContext.POSITIONS, UsageContext.NORMS),
             stats.get("field2").keySet()
         );
         assertEquals(1L * numShards, stats.get("field2").getTerms());