Fix geoip databases index access after system feature migration (again)

docs/changelog/122938.yaml

@@ -0,0 +1,5 @@
+pr: 122938
+summary: Fix geoip databases index access after system feature migration (again)
+area: Ingest Node
+type: bug
+issues: []

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
+    }
 }

server/src/main/java/org/elasticsearch/cluster/metadata/IndexAbstractionResolver.java

@@ -14,6 +14,7 @@
 import org.elasticsearch.common.regex.Regex;
 import org.elasticsearch.core.Nullable;
 import org.elasticsearch.core.Tuple;
+import org.elasticsearch.index.Index;
 import org.elasticsearch.index.IndexNotFoundException;
 import org.elasticsearch.indices.SystemIndices.SystemIndexAccessLevel;
 
@@ -158,7 +159,26 @@ public static boolean isIndexVisible(
             if (indexAbstraction.isSystem()) {
                 // check if it is net new
                 if (resolver.getNetNewSystemIndexPredicate().test(indexAbstraction.getName())) {
-                    return isSystemIndexVisible(resolver, indexAbstraction);
+                    // don't give this code any particular credit for being *correct*. it's just trying to resolve a combination of
+                    // issues in a way that happens to *work*. there's probably a better way of writing things such that this won't
+                    // be necessary, but for the moment, it happens to be expedient to write things this way.
+
+                    // unwrap the alias and re-run the function on the write index of the alias -- that is, the alias is visible if
+                    // the concrete index that it refers to is visible
+                    Index writeIndex = indexAbstraction.getWriteIndex();
+                    if (writeIndex == null) {
+                        return false;
+                    } else {
+                        return isIndexVisible(
+                            expression,
+                            selectorString,
+                            writeIndex.getName(),
+                            indicesOptions,
+                            metadata,
+                            resolver,
+                            includeDataStreams
+                        );
+                    }
                 }
             }
 

server/src/test/java/org/elasticsearch/cluster/metadata/IndexAbstractionResolverTests.java

@@ -29,6 +29,7 @@
 import java.util.function.Supplier;
 
 import static org.elasticsearch.index.mapper.MapperService.SINGLE_MAPPING_NAME;
+import static org.elasticsearch.indices.SystemIndices.EXTERNAL_SYSTEM_INDEX_ACCESS_CONTROL_HEADER_KEY;
 import static org.elasticsearch.indices.SystemIndices.SYSTEM_INDEX_ACCESS_CONTROL_HEADER_KEY;
 import static org.elasticsearch.xcontent.XContentFactory.jsonBuilder;
 import static org.hamcrest.Matchers.contains;
@@ -218,18 +219,6 @@ public void testIsIndexVisible() {
         assertThat(isIndexVisible("data-stream1", "failures"), is(true));
     }
 
-    private boolean isIndexVisible(String index, String selector) {
-        return IndexAbstractionResolver.isIndexVisible(
-            "*",
-            selector,
-            index,
-            IndicesOptions.strictExpandHidden(),
-            metadata,
-            indexNameExpressionResolver,
-            true
-        );
-    }
-
     public void testIsNetNewSystemIndexVisible() {
         final Settings settings = Settings.builder()
             .put("index.number_of_replicas", 0)
@@ -269,16 +258,71 @@ public void testIsNetNewSystemIndexVisible() {
             List.of(new SystemIndices.Feature("name", "description", List.of(fooDescriptor, barDescriptor)))
         );
 
-        final ThreadContext threadContext = new ThreadContext(Settings.EMPTY);
-        threadContext.putHeader(SYSTEM_INDEX_ACCESS_CONTROL_HEADER_KEY, "false");
-        indexNameExpressionResolver = new IndexNameExpressionResolver(threadContext, systemIndices);
-        indexAbstractionResolver = new IndexAbstractionResolver(indexNameExpressionResolver);
-
         metadata = Metadata.builder().put(foo, true).put(barReindexed, true).put(other, true).build();
 
-        assertThat(isIndexVisible("other", "*"), is(true));
-        assertThat(isIndexVisible(".foo", "*"), is(false));
-        assertThat(isIndexVisible(".bar", "*"), is(false));
+        // these indices options are for the GET _data_streams case
+        final IndicesOptions noHiddenNoAliases = IndicesOptions.builder()
+            .wildcardOptions(
+                IndicesOptions.WildcardOptions.builder()
+                    .matchOpen(true)
+                    .matchClosed(true)
+                    .includeHidden(false)
+                    .resolveAliases(false)
+                    .build()
+            )
+            .build();
+
+        {
+            final ThreadContext threadContext = new ThreadContext(Settings.EMPTY);
+            threadContext.putHeader(SYSTEM_INDEX_ACCESS_CONTROL_HEADER_KEY, "true");
+            indexNameExpressionResolver = new IndexNameExpressionResolver(threadContext, systemIndices);
+            indexAbstractionResolver = new IndexAbstractionResolver(indexNameExpressionResolver);
+
+            // this covers the GET * case -- with system access, you can see everything
+            assertThat(isIndexVisible("other", "*"), is(true));
+            assertThat(isIndexVisible(".foo", "*"), is(true));
+            assertThat(isIndexVisible(".bar", "*"), is(true));
+
+            // but if you don't ask for hidden and aliases, you won't see hidden indices or aliases, naturally
+            assertThat(isIndexVisible("other", "*", noHiddenNoAliases), is(true));
+            assertThat(isIndexVisible(".foo", "*", noHiddenNoAliases), is(false));
+            assertThat(isIndexVisible(".bar", "*", noHiddenNoAliases), is(false));
+        }
+
+        {
+            final ThreadContext threadContext = new ThreadContext(Settings.EMPTY);
+            threadContext.putHeader(SYSTEM_INDEX_ACCESS_CONTROL_HEADER_KEY, "false");
+            indexNameExpressionResolver = new IndexNameExpressionResolver(threadContext, systemIndices);
+            indexAbstractionResolver = new IndexAbstractionResolver(indexNameExpressionResolver);
+
+            // this covers the GET * case -- without system access, you can't see everything
+            assertThat(isIndexVisible("other", "*"), is(true));
+            assertThat(isIndexVisible(".foo", "*"), is(false));
+            assertThat(isIndexVisible(".bar", "*"), is(false));
+
+            // no difference here in the datastream case, you can't see these then, either
+            assertThat(isIndexVisible("other", "*", noHiddenNoAliases), is(true));
+            assertThat(isIndexVisible(".foo", "*", noHiddenNoAliases), is(false));
+            assertThat(isIndexVisible(".bar", "*", noHiddenNoAliases), is(false));
+        }
+
+        {
+            final ThreadContext threadContext = new ThreadContext(Settings.EMPTY);
+            threadContext.putHeader(SYSTEM_INDEX_ACCESS_CONTROL_HEADER_KEY, "true");
+            threadContext.putHeader(EXTERNAL_SYSTEM_INDEX_ACCESS_CONTROL_HEADER_KEY, "some-elastic-product");
+            indexNameExpressionResolver = new IndexNameExpressionResolver(threadContext, systemIndices);
+            indexAbstractionResolver = new IndexAbstractionResolver(indexNameExpressionResolver);
+
+            // this covers the GET * case -- with product (only) access, you can't see everything
+            assertThat(isIndexVisible("other", "*"), is(true));
+            assertThat(isIndexVisible(".foo", "*"), is(false));
+            assertThat(isIndexVisible(".bar", "*"), is(false));
+
+            // no difference here in the datastream case, you can't see these then, either
+            assertThat(isIndexVisible("other", "*", noHiddenNoAliases), is(true));
+            assertThat(isIndexVisible(".foo", "*", noHiddenNoAliases), is(false));
+            assertThat(isIndexVisible(".bar", "*", noHiddenNoAliases), is(false));
+        }
     }
 
     private static XContentBuilder mappings() {
@@ -306,4 +350,12 @@ private List<String> resolveAbstractionsSelectorAllowed(List<String> expressions
     private List<String> resolveAbstractions(List<String> expressions, IndicesOptions indicesOptions, Supplier<Set<String>> mask) {
         return indexAbstractionResolver.resolveIndexAbstractions(expressions, indicesOptions, metadata, mask, (idx) -> true, true);
     }
+
+    private boolean isIndexVisible(String index, String selector) {
+        return isIndexVisible(index, selector, IndicesOptions.strictExpandHidden());
+    }
+
+    private boolean isIndexVisible(String index, String selector, IndicesOptions indicesOptions) {
+        return IndexAbstractionResolver.isIndexVisible("*", selector, index, indicesOptions, metadata, indexNameExpressionResolver, true);
+    }
 }