Mute SignificantTermsSignificanceScoreIT#testScriptScore (elastic#99691)

relates elastic#99690

server/src/internalClusterTest/java/org/elasticsearch/search/aggregations/bucket/SignificantTermsSignificanceScoreIT.java

@@ -472,6 +472,7 @@ private void indexEqualTestData() throws ExecutionException, InterruptedExceptio
         indexRandom(true, false, indexRequestBuilders);
     }
 
+    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/99690")
     public void testScriptScore() throws ExecutionException, InterruptedException, IOException {
         String type = randomBoolean() ? "text" : "long";
         indexRandomFrequencies01(type);