Updates the deprecation info API to not warn about system indices and data streams

docs/changelog/122951.yaml

@@ -0,0 +1,6 @@
+pr: 122951
+summary: Updates the deprecation info API to not warn about system indices and data
+  streams
+area: Indices APIs
+type: bug
+issues: []

x-pack/plugin/core/src/main/java/org/elasticsearch/xpack/core/deprecation/DeprecatedIndexPredicate.java

@@ -49,10 +49,15 @@ public static Predicate<Index> getReindexRequiredPredicate(Metadata metadata, bo
      */
     public static boolean reindexRequired(IndexMetadata indexMetadata, boolean filterToBlockedStatus) {
         return creationVersionBeforeMinimumWritableVersion(indexMetadata)
+            && isNotSystem(indexMetadata)
             && isNotSearchableSnapshot(indexMetadata)
             && matchBlockedStatus(indexMetadata, filterToBlockedStatus);
     }
 
+    private static boolean isNotSystem(IndexMetadata indexMetadata) {
+        return indexMetadata.isSystem() == false;
+    }
+
     private static boolean isNotSearchableSnapshot(IndexMetadata indexMetadata) {
         return indexMetadata.isSearchableSnapshot() == false;
     }

x-pack/plugin/deprecation/src/main/java/org/elasticsearch/xpack/deprecation/DataStreamDeprecationChecker.java

@@ -72,12 +72,14 @@ public Map<String, List<DeprecationIssue>> check(ClusterState clusterState) {
         Map<String, List<DeprecationIssue>> dataStreamIssues = new HashMap<>();
         for (String dataStreamName : dataStreamNames) {
             DataStream dataStream = clusterState.metadata().dataStreams().get(dataStreamName);
-            List<DeprecationIssue> issuesForSingleDataStream = DATA_STREAM_CHECKS.stream()
-                .map(c -> c.apply(dataStream, clusterState))
-                .filter(Objects::nonNull)
-                .toList();
-            if (issuesForSingleDataStream.isEmpty() == false) {
-                dataStreamIssues.put(dataStreamName, issuesForSingleDataStream);
+            if (dataStream.isSystem() == false) {
+                List<DeprecationIssue> issuesForSingleDataStream = DATA_STREAM_CHECKS.stream()
+                    .map(c -> c.apply(dataStream, clusterState))
+                    .filter(Objects::nonNull)
+                    .toList();
+                if (issuesForSingleDataStream.isEmpty() == false) {
+                    dataStreamIssues.put(dataStreamName, issuesForSingleDataStream);
+                }
             }
         }
         return dataStreamIssues.isEmpty() ? Map.of() : dataStreamIssues;

x-pack/plugin/deprecation/src/test/java/org/elasticsearch/xpack/deprecation/DataStreamDeprecationCheckerTests.java

@@ -302,4 +302,52 @@ public void testOldIndicesIgnoredWarningCheck() {
         assertThat(issuesByDataStream.get(dataStream.getName()), equalTo(List.of(expected)));
     }
 
+    public void testOldSystemDataStreamIgnored() {
+        // We do not want system data streams coming back in the deprecation info API
+        int oldIndexCount = randomIntBetween(1, 100);
+        int newIndexCount = randomIntBetween(1, 100);
+        List<Index> allIndices = new ArrayList<>();
+        Map<String, IndexMetadata> nameToIndexMetadata = new HashMap<>();
+        for (int i = 0; i < oldIndexCount; i++) {
+            Settings.Builder settings = settings(IndexVersion.fromId(7170099));
+
+            String indexName = "old-data-stream-index-" + i;
+            settings.put(MetadataIndexStateService.VERIFIED_READ_ONLY_SETTING.getKey(), true);
+
+            IndexMetadata oldIndexMetadata = IndexMetadata.builder(indexName)
+                .settings(settings)
+                .numberOfShards(1)
+                .numberOfReplicas(0)
+                .build();
+            allIndices.add(oldIndexMetadata.getIndex());
+            nameToIndexMetadata.put(oldIndexMetadata.getIndex().getName(), oldIndexMetadata);
+        }
+        for (int i = 0; i < newIndexCount; i++) {
+            Index newIndex = createNewIndex(i, false, nameToIndexMetadata);
+            allIndices.add(newIndex);
+        }
+        DataStream dataStream = new DataStream(
+            randomAlphaOfLength(10),
+            allIndices,
+            randomNegativeLong(),
+            Map.of(),
+            true,
+            false,
+            true,
+            randomBoolean(),
+            randomFrom(IndexMode.values()),
+            null,
+            randomFrom(DataStreamOptions.EMPTY, DataStreamOptions.FAILURE_STORE_DISABLED, DataStreamOptions.FAILURE_STORE_ENABLED, null),
+            List.of(),
+            randomBoolean(),
+            null
+        );
+        Metadata metadata = Metadata.builder()
+            .indices(nameToIndexMetadata)
+            .dataStreams(Map.of(dataStream.getName(), dataStream), Map.of())
+            .build();
+        ClusterState clusterState = ClusterState.builder(ClusterName.DEFAULT).metadata(metadata).build();
+        assertThat(checker.check(clusterState), equalTo(Map.of()));
+    }
+
 }

x-pack/plugin/deprecation/src/test/java/org/elasticsearch/xpack/deprecation/IndexDeprecationCheckerTests.java

@@ -298,6 +298,28 @@ public void testOldIndicesIgnoredWarningCheck() {
         assertEquals(List.of(expected), issuesByIndex.get("test"));
     }
 
+    public void testOldSystemIndicesIgnored() {
+        // We do not want system indices coming back in the deprecation info API
+        Settings.Builder settings = settings(OLD_VERSION).put(MetadataIndexStateService.VERIFIED_READ_ONLY_SETTING.getKey(), true);
+        IndexMetadata indexMetadata = IndexMetadata.builder("test")
+            .system(true)
+            .settings(settings)
+            .numberOfShards(1)
+            .numberOfReplicas(0)
+            .state(indexMetdataState)
+            .build();
+        ClusterState clusterState = ClusterState.builder(ClusterState.EMPTY_STATE)
+            .metadata(Metadata.builder().put(indexMetadata, true))
+            .blocks(clusterBlocksForIndices(indexMetadata))
+            .build();
+        Map<String, List<DeprecationIssue>> issuesByIndex = checker.check(
+            clusterState,
+            new DeprecationInfoAction.Request(TimeValue.THIRTY_SECONDS),
+            emptyPrecomputedData
+        );
+        assertThat(issuesByIndex, equalTo(Map.of()));
+    }
+
     private IndexMetadata readonlyIndexMetadata(String indexName, IndexVersion indexVersion) {
         Settings.Builder settings = settings(indexVersion).put(MetadataIndexStateService.VERIFIED_READ_ONLY_SETTING.getKey(), true);
         return IndexMetadata.builder(indexName).settings(settings).numberOfShards(1).numberOfReplicas(0).state(indexMetdataState).build();