Fix S3SearchableSnapshotsCredentialsReloadIT

Author: DaveCTurner

x-pack/plugin/searchable-snapshots/qa/s3/src/javaRestTest/java/org/elasticsearch/xpack/searchablesnapshots/s3/S3SearchableSnapshotsCredentialsReloadIT.java

@@ -279,7 +279,6 @@ void ensureSearchFailure() throws IOException {
                 allOf(
                     containsString("Access denied"),
                     containsString("Status Code: 403"),
-                    containsString("Error Code: AccessDenied"),
                     containsString("failed to read data from cache")
                 )
             );