Add a failing test

After migrating the system indices, the having .geoip_databases as an
index-behind-an-alias ends up resulting in `GET _data_stream` blowing
up.

Author: joegallo

modules/ingest-geoip/qa/full-cluster-restart/src/javaRestTest/java/org/elasticsearch/ingest/geoip/FullClusterRestartIT.java

@@ -123,13 +123,19 @@ public void testGeoIpSystemFeaturesMigration() throws Exception {
 
             // as should a normal get *
             assertBusy(() -> testGetStar(List.of("my-index-00001"), maybeSecurityIndex));
+
+            // and getting data streams
+            assertBusy(() -> testGetDatastreams());
         } else {
             // after the upgrade, but before the migration, Kibana should work
             assertBusy(() -> testGetStarAsKibana(List.of("my-index-00001"), maybeSecurityIndex));
 
             // as should a normal get *
             assertBusy(() -> testGetStar(List.of("my-index-00001"), maybeSecurityIndex));
 
+            // and getting data streams
+            assertBusy(() -> testGetDatastreams());
+
             // migrate the system features and give the cluster a moment to settle
             Request migrateSystemFeatures = new Request("POST", "/_migration/system_features");
             assertOK(client().performRequest(migrateSystemFeatures));
@@ -144,6 +150,9 @@ public void testGeoIpSystemFeaturesMigration() throws Exception {
             // as should a normal get *
             assertBusy(() -> testGetStar(List.of("my-index-00001"), maybeSecurityIndexReindexed));
 
+            // and getting data streams
+            assertBusy(() -> testGetDatastreams());
+
             Request disableDownloader = new Request("PUT", "/_cluster/settings");
             disableDownloader.setJsonEntity("""
                 {"persistent": {"ingest.geoip.downloader.enabled": false}}
@@ -257,4 +266,15 @@ private void testGetStarAsKibana(List<String> indexNames, @Nullable List<String>
         Map<String, Object> map = responseAsMap(response);
         assertThat(map.keySet(), is(new HashSet<>(indexNames)));
     }
+
+    private void testGetDatastreams() throws IOException {
+        Request getStar = new Request("GET", "_data_stream");
+        getStar.setOptions(
+            RequestOptions.DEFAULT.toBuilder().setWarningsHandler(WarningsHandler.PERMISSIVE) // we don't care about warnings, just errors
+        );
+        Response response = client().performRequest(getStar);
+        assertOK(response);
+
+        // note: we don't actually care about the response, just that there was one and that it didn't error out on us
+    }
 }