[8.19] [ML] Prevent retention classes from failing when deleting documents in read-only indices (#125408)

docs/changelog/125408.yaml

@@ -0,0 +1,6 @@
+pr: 125408
+summary: Prevent ML data retention logic from failing when deleting documents in read-only
+  indices
+area: Machine Learning
+type: bug
+issues: []

x-pack/plugin/ml/src/internalClusterTest/java/org/elasticsearch/xpack/ml/integration/UnusedStatsRemoverIT.java

@@ -10,6 +10,7 @@
 import org.elasticsearch.action.index.IndexRequest;
 import org.elasticsearch.action.support.PlainActionFuture;
 import org.elasticsearch.client.internal.OriginSettingClient;
+import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.unit.ByteSizeValue;
 import org.elasticsearch.indices.TestIndexNameExpressionResolver;
 import org.elasticsearch.tasks.TaskId;
@@ -63,91 +64,118 @@ public void createComponents() {
     }
 
     public void testRemoveUnusedStats() throws Exception {
+        String modelId = "model-with-stats";
+        putDFA(modelId);
 
-        prepareIndex("foo").setId("some-empty-doc").setSource("{}", XContentType.JSON).get();
-
-        PutDataFrameAnalyticsAction.Request request = new PutDataFrameAnalyticsAction.Request(
-            new DataFrameAnalyticsConfig.Builder().setId("analytics-with-stats")
-                .setModelMemoryLimit(ByteSizeValue.ofGb(1))
-                .setSource(new DataFrameAnalyticsSource(new String[] { "foo" }, null, null, null))
-                .setDest(new DataFrameAnalyticsDest("bar", null))
-                .setAnalysis(new Regression("prediction"))
-                .build()
-        );
-        client.execute(PutDataFrameAnalyticsAction.INSTANCE, request).actionGet();
-
-        client.execute(
-            PutTrainedModelAction.INSTANCE,
-            new PutTrainedModelAction.Request(
-                TrainedModelConfig.builder()
-                    .setModelId("model-with-stats")
-                    .setInferenceConfig(RegressionConfig.EMPTY_PARAMS)
-                    .setInput(new TrainedModelInput(Arrays.asList("foo", "bar")))
-                    .setParsedDefinition(
-                        new TrainedModelDefinition.Builder().setPreProcessors(Collections.emptyList())
-                            .setTrainedModel(
-                                Tree.builder()
-                                    .setFeatureNames(Arrays.asList("foo", "bar"))
-                                    .setRoot(TreeNode.builder(0).setLeafValue(42))
-                                    .build()
-                            )
-                    )
-                    .validate(true)
-                    .build(),
-                false
-            )
-        ).actionGet();
-
+        // Existing analytics and models
         indexStatDocument(new DataCounts("analytics-with-stats", 1, 1, 1), DataCounts.documentId("analytics-with-stats"));
-        indexStatDocument(new DataCounts("missing-analytics-with-stats", 1, 1, 1), DataCounts.documentId("missing-analytics-with-stats"));
+        indexStatDocument(new InferenceStats(1, 1, 1, 1, modelId, "test", Instant.now()), InferenceStats.docId(modelId, "test"));
         indexStatDocument(
             new InferenceStats(1, 1, 1, 1, TrainedModelProvider.MODELS_STORED_AS_RESOURCE.iterator().next(), "test", Instant.now()),
             InferenceStats.docId(TrainedModelProvider.MODELS_STORED_AS_RESOURCE.iterator().next(), "test")
         );
+
+        // Unused analytics/model stats
+        indexStatDocument(new DataCounts("missing-analytics-with-stats", 1, 1, 1), DataCounts.documentId("missing-analytics-with-stats"));
         indexStatDocument(
             new InferenceStats(1, 1, 1, 1, "missing-model", "test", Instant.now()),
             InferenceStats.docId("missing-model", "test")
         );
+
+        refreshStatsIndex();
+        runUnusedStatsRemover();
+
+        final String index = MlStatsIndex.TEMPLATE_NAME + "-000001";
+
+        // Validate expected docs
+        assertDocExists(index, InferenceStats.docId(modelId, "test"));
+        assertDocExists(index, DataCounts.documentId("analytics-with-stats"));
+        assertDocExists(index, InferenceStats.docId(TrainedModelProvider.MODELS_STORED_AS_RESOURCE.iterator().next(), "test"));
+
+        // Validate removed docs
+        assertDocDoesNotExist(index, InferenceStats.docId("missing-model", "test"));
+        assertDocDoesNotExist(index, DataCounts.documentId("missing-analytics-with-stats"));
+    }
+
+    public void testRemovingUnusedStatsFromReadOnlyIndexShouldFailSilently() throws Exception {
+        String modelId = "model-with-stats";
+        putDFA(modelId);
+
         indexStatDocument(
-            new InferenceStats(1, 1, 1, 1, "model-with-stats", "test", Instant.now()),
-            InferenceStats.docId("model-with-stats", "test")
+            new InferenceStats(1, 1, 1, 1, "missing-model", "test", Instant.now()),
+            InferenceStats.docId("missing-model", "test")
         );
-        client().admin().indices().prepareRefresh(MlStatsIndex.indexPattern()).get();
+        makeIndexReadOnly();
+        refreshStatsIndex();
 
-        PlainActionFuture<Boolean> deletionListener = new PlainActionFuture<>();
-        UnusedStatsRemover statsRemover = new UnusedStatsRemover(client, new TaskId("test", 0L));
-        statsRemover.remove(10000.0f, deletionListener, () -> false);
-        deletionListener.actionGet();
+        runUnusedStatsRemover();
+        refreshStatsIndex();
 
-        client().admin().indices().prepareRefresh(MlStatsIndex.indexPattern()).get();
+        final String index = MlStatsIndex.TEMPLATE_NAME + "-000001";
+        assertDocExists(index, InferenceStats.docId("missing-model", "test")); // should still exist
+    }
 
-        final String initialStateIndex = MlStatsIndex.TEMPLATE_NAME + "-000001";
+    private void putDFA(String modelId) {
+        prepareIndex("foo").setId("some-empty-doc").setSource("{}", XContentType.JSON).get();
 
-        // Make sure that stats that should exist still exist
-        assertTrue(client().prepareGet(initialStateIndex, InferenceStats.docId("model-with-stats", "test")).get().isExists());
-        assertTrue(
-            client().prepareGet(
-                initialStateIndex,
-                InferenceStats.docId(TrainedModelProvider.MODELS_STORED_AS_RESOURCE.iterator().next(), "test")
-            ).get().isExists()
+        PutDataFrameAnalyticsAction.Request analyticsRequest = new PutDataFrameAnalyticsAction.Request(
+            new DataFrameAnalyticsConfig.Builder().setId("analytics-with-stats")
+                .setModelMemoryLimit(ByteSizeValue.ofGb(1))
+                .setSource(new DataFrameAnalyticsSource(new String[] { "foo" }, null, null, null))
+                .setDest(new DataFrameAnalyticsDest("bar", null))
+                .setAnalysis(new Regression("prediction"))
+                .build()
         );
-        assertTrue(client().prepareGet(initialStateIndex, DataCounts.documentId("analytics-with-stats")).get().isExists());
-
-        // make sure that unused stats were deleted
-        assertFalse(client().prepareGet(initialStateIndex, DataCounts.documentId("missing-analytics-with-stats")).get().isExists());
-        assertFalse(client().prepareGet(initialStateIndex, InferenceStats.docId("missing-model", "test")).get().isExists());
+        client.execute(PutDataFrameAnalyticsAction.INSTANCE, analyticsRequest).actionGet();
+
+        TrainedModelDefinition.Builder definition = new TrainedModelDefinition.Builder().setPreProcessors(Collections.emptyList())
+            .setTrainedModel(
+                Tree.builder().setFeatureNames(Arrays.asList("foo", "bar")).setRoot(TreeNode.builder(0).setLeafValue(42)).build()
+            );
+
+        TrainedModelConfig modelConfig = TrainedModelConfig.builder()
+            .setModelId(modelId)
+            .setInferenceConfig(RegressionConfig.EMPTY_PARAMS)
+            .setInput(new TrainedModelInput(Arrays.asList("foo", "bar")))
+            .setParsedDefinition(definition)
+            .validate(true)
+            .build();
+
+        client.execute(PutTrainedModelAction.INSTANCE, new PutTrainedModelAction.Request(modelConfig, false)).actionGet();
     }
 
     private void indexStatDocument(ToXContentObject object, String docId) throws Exception {
-        ToXContent.Params params = new ToXContent.MapParams(
-            Collections.singletonMap(ToXContentParams.FOR_INTERNAL_STORAGE, Boolean.toString(true))
-        );
-        IndexRequest doc = new IndexRequest(MlStatsIndex.writeAlias());
-        doc.id(docId);
+        IndexRequest doc = new IndexRequest(MlStatsIndex.writeAlias()).id(docId);
         try (XContentBuilder builder = XContentFactory.jsonBuilder()) {
-            object.toXContent(builder, params);
+            object.toXContent(builder, new ToXContent.MapParams(Collections.singletonMap(ToXContentParams.FOR_INTERNAL_STORAGE, "true")));
             doc.source(builder);
             client.index(doc).actionGet();
         }
     }
+
+    private void refreshStatsIndex() {
+        client().admin().indices().prepareRefresh(MlStatsIndex.indexPattern()).get();
+    }
+
+    private void runUnusedStatsRemover() {
+        PlainActionFuture<Boolean> deletionListener = new PlainActionFuture<>();
+        new UnusedStatsRemover(client, new TaskId("test", 0L)).remove(10000.0f, deletionListener, () -> false);
+        deletionListener.actionGet();
+    }
+
+    private void makeIndexReadOnly() {
+        client().admin()
+            .indices()
+            .prepareUpdateSettings(MlStatsIndex.indexPattern())
+            .setSettings(Settings.builder().put("index.blocks.write", true))
+            .get();
+    }
+
+    private void assertDocExists(String index, String docId) {
+        assertTrue(client().prepareGet(index, docId).get().isExists());
+    }
+
+    private void assertDocDoesNotExist(String index, String docId) {
+        assertFalse(client().prepareGet(index, docId).get().isExists());
+    }
 }

x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/MachineLearning.java

@@ -364,6 +364,7 @@
 import org.elasticsearch.xpack.ml.job.process.normalizer.NativeNormalizerProcessFactory;
 import org.elasticsearch.xpack.ml.job.process.normalizer.NormalizerFactory;
 import org.elasticsearch.xpack.ml.job.process.normalizer.NormalizerProcessFactory;
+import org.elasticsearch.xpack.ml.job.retention.WritableIndexExpander;
 import org.elasticsearch.xpack.ml.job.snapshot.upgrader.SnapshotUpgradeTaskExecutor;
 import org.elasticsearch.xpack.ml.job.task.OpenJobPersistentTasksExecutor;
 import org.elasticsearch.xpack.ml.notifications.AnomalyDetectionAuditor;
@@ -922,6 +923,9 @@ public Collection<?> createComponents(PluginServices services) {
         IndexNameExpressionResolver indexNameExpressionResolver = services.indexNameExpressionResolver();
         TelemetryProvider telemetryProvider = services.telemetryProvider();
 
+        // Initialize WritableIndexExpander
+        WritableIndexExpander.initialize(clusterService, indexNameExpressionResolver);
+
         if (enabled == false) {
             // Holders for @link(MachineLearningFeatureSetUsage) which needs access to job manager and ML extension,
             // both empty if ML is disabled

x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/action/TransportDeleteExpiredDataAction.java

@@ -240,6 +240,7 @@ private List<MlDataRemover> createDataRemovers(
         TaskId parentTaskId,
         AnomalyDetectionAuditor anomalyDetectionAuditor
     ) {
+
         return Arrays.asList(
             new ExpiredResultsRemover(
                 originClient,
@@ -252,8 +253,8 @@ private List<MlDataRemover> createDataRemovers(
             new ExpiredModelSnapshotsRemover(
                 originClient,
                 new WrappedBatchedJobsIterator(new SearchAfterJobsIterator(originClient)),
-                threadPool,
                 parentTaskId,
+                threadPool,
                 jobResultsProvider,
                 anomalyDetectionAuditor
             ),
@@ -277,8 +278,8 @@ private List<MlDataRemover> createDataRemovers(List<Job> jobs, TaskId parentTask
             new ExpiredModelSnapshotsRemover(
                 client,
                 new VolatileCursorIterator<>(jobs),
-                threadPool,
                 parentTaskId,
+                threadPool,
                 jobResultsProvider,
                 anomalyDetectionAuditor
             ),

x-pack/plugin/ml/src/main/java/org/elasticsearch/xpack/ml/job/persistence/JobDataDeleter.java

@@ -65,6 +65,7 @@
 import org.elasticsearch.xpack.core.ml.job.results.Result;
 import org.elasticsearch.xpack.core.ml.utils.ExceptionsHelper;
 import org.elasticsearch.xpack.core.security.user.InternalUsers;
+import org.elasticsearch.xpack.ml.job.retention.WritableIndexExpander;
 import org.elasticsearch.xpack.ml.utils.MlIndicesUtils;
 
 import java.util.ArrayList;
@@ -131,7 +132,10 @@ public void deleteModelSnapshots(List<ModelSnapshot> modelSnapshots, ActionListe
             indices.add(AnomalyDetectorsIndex.jobResultsAliasedName(modelSnapshot.getJobId()));
         }
 
-        DeleteByQueryRequest deleteByQueryRequest = new DeleteByQueryRequest(indices.toArray(new String[0])).setRefresh(true)
+        String[] indicesToQuery = removeReadOnlyIndices(new ArrayList<>(indices), listener, "model snapshots", null);
+        if (indicesToQuery.length == 0) return;
+
+        DeleteByQueryRequest deleteByQueryRequest = new DeleteByQueryRequest(indicesToQuery).setRefresh(true)
             .setIndicesOptions(IndicesOptions.lenientExpandOpen())
             .setQuery(QueryBuilders.idsQuery().addIds(idsToDelete.toArray(new String[0])));
 
@@ -179,7 +183,16 @@ public void deleteAnnotations(
             boolQuery.filter(QueryBuilders.termsQuery(Annotation.EVENT.getPreferredName(), eventsToDelete));
         }
         QueryBuilder query = QueryBuilders.constantScoreQuery(boolQuery);
-        DeleteByQueryRequest dbqRequest = new DeleteByQueryRequest(AnnotationIndex.READ_ALIAS_NAME).setQuery(query)
+
+        String[] indicesToQuery = removeReadOnlyIndices(
+            List.of(AnnotationIndex.READ_ALIAS_NAME),
+            listener,
+            "annotations",
+            () -> listener.onResponse(true)
+        );
+        if (indicesToQuery.length == 0) return;
+
+        DeleteByQueryRequest dbqRequest = new DeleteByQueryRequest(indicesToQuery).setQuery(query)
             .setIndicesOptions(IndicesOptions.lenientExpandOpen())
             .setAbortOnVersionConflict(false)
             .setRefresh(true)
@@ -197,6 +210,28 @@ public void deleteAnnotations(
         );
     }
 
+    private <T> String[] removeReadOnlyIndices(
+        List<String> indicesToQuery,
+        ActionListener<T> listener,
+        String entityType,
+        Runnable onEmpty
+    ) {
+        try {
+            indicesToQuery = WritableIndexExpander.getInstance().getWritableIndices(indicesToQuery);
+        } catch (Exception e) {
+            logger.error("Failed to get writable indices for [" + jobId + "]", e);
+            listener.onFailure(e);
+            return new String[0];
+        }
+        if (indicesToQuery.isEmpty()) {
+            logger.info("No writable {} indices found for [{}] job. No {} to remove.", entityType, jobId, entityType);
+            if (onEmpty != null) {
+                onEmpty.run();
+            }
+        }
+        return indicesToQuery.toArray(String[]::new);
+    }
+
     /**
      * Asynchronously delete all result types (Buckets, Records, Influencers) from {@code cutOffTime}.
      * Forecasts are <em>not</em> deleted, as they will not be automatically regenerated after
@@ -218,7 +253,14 @@ public void deleteResultsFromTime(long cutoffEpochMs, ActionListener<Boolean> li
                 )
             )
             .filter(QueryBuilders.rangeQuery(Result.TIMESTAMP.getPreferredName()).gte(cutoffEpochMs));
-        DeleteByQueryRequest dbqRequest = new DeleteByQueryRequest(AnomalyDetectorsIndex.jobResultsAliasedName(jobId)).setQuery(query)
+        String[] indicesToQuery = removeReadOnlyIndices(
+            List.of(AnomalyDetectorsIndex.jobResultsAliasedName(jobId)),
+            listener,
+            "results",
+            () -> listener.onResponse(true)
+        );
+        if (indicesToQuery.length == 0) return;
+        DeleteByQueryRequest dbqRequest = new DeleteByQueryRequest(indicesToQuery).setQuery(query)
             .setIndicesOptions(IndicesOptions.lenientExpandOpen())
             .setAbortOnVersionConflict(false)
             .setRefresh(true)
@@ -263,9 +305,14 @@ public void deleteInterimResults() {
      * @param listener Response listener
      */
     public void deleteDatafeedTimingStats(ActionListener<BulkByScrollResponse> listener) {
-        DeleteByQueryRequest deleteByQueryRequest = new DeleteByQueryRequest(AnomalyDetectorsIndex.jobResultsAliasedName(jobId)).setRefresh(
-            true
-        )
+        String[] indicesToQuery = removeReadOnlyIndices(
+            List.of(AnomalyDetectorsIndex.jobResultsAliasedName(jobId)),
+            listener,
+            "datafeed timing stats",
+            null
+        );
+        if (indicesToQuery.length == 0) return;
+        DeleteByQueryRequest deleteByQueryRequest = new DeleteByQueryRequest(indicesToQuery).setRefresh(true)
             .setIndicesOptions(IndicesOptions.lenientExpandOpen())
             .setQuery(QueryBuilders.idsQuery().addIds(DatafeedTimingStats.documentId(jobId)));
 
@@ -455,7 +502,9 @@ private void deleteResultsByQuery(
         ActionListener<BroadcastResponse> refreshListener = ActionListener.wrap(refreshResponse -> {
             logger.info("[{}] running delete by query on [{}]", jobId, String.join(", ", indices));
             ConstantScoreQueryBuilder query = new ConstantScoreQueryBuilder(new TermQueryBuilder(Job.ID.getPreferredName(), jobId));
-            DeleteByQueryRequest request = new DeleteByQueryRequest(indices).setQuery(query)
+            String[] indicesToQuery = removeReadOnlyIndices(List.of(indices), listener, "results", null);
+            if (indicesToQuery.length == 0) return;
+            DeleteByQueryRequest request = new DeleteByQueryRequest(indicesToQuery).setQuery(query)
                 .setIndicesOptions(MlIndicesUtils.addIgnoreUnavailable(IndicesOptions.lenientExpandOpenHidden()))
                 .setSlices(AbstractBulkByScrollRequest.AUTO_SLICES)
                 .setAbortOnVersionConflict(false)
@@ -523,7 +572,16 @@ private static IndicesAliasesRequest buildRemoveAliasesRequest(GetAliasesRespons
     private void deleteQuantiles(@SuppressWarnings("HiddenField") String jobId, ActionListener<Boolean> finishedHandler) {
         // Just use ID here, not type, as trying to delete different types spams the logs with an exception stack trace
         IdsQueryBuilder query = new IdsQueryBuilder().addIds(Quantiles.documentId(jobId));
-        DeleteByQueryRequest request = new DeleteByQueryRequest(AnomalyDetectorsIndex.jobStateIndexPattern()).setQuery(query)
+
+        String[] indicesToQuery = removeReadOnlyIndices(
+            List.of(AnomalyDetectorsIndex.jobStateIndexPattern()),
+            finishedHandler,
+            "quantiles",
+            () -> finishedHandler.onResponse(true)
+        );
+        if (indicesToQuery.length == 0) return;
+
+        DeleteByQueryRequest request = new DeleteByQueryRequest(indicesToQuery).setQuery(query)
             .setIndicesOptions(MlIndicesUtils.addIgnoreUnavailable(IndicesOptions.lenientExpandOpen()))
             .setAbortOnVersionConflict(false)
             .setRefresh(true);
@@ -553,7 +611,14 @@ private void deleteCategorizerState(
     ) {
         // Just use ID here, not type, as trying to delete different types spams the logs with an exception stack trace
         IdsQueryBuilder query = new IdsQueryBuilder().addIds(CategorizerState.documentId(jobId, docNum));
-        DeleteByQueryRequest request = new DeleteByQueryRequest(AnomalyDetectorsIndex.jobStateIndexPattern()).setQuery(query)
+        String[] indicesToQuery = removeReadOnlyIndices(
+            List.of(AnomalyDetectorsIndex.jobStateIndexPattern()),
+            finishedHandler,
+            "categorizer state",
+            () -> finishedHandler.onResponse(true)
+        );
+        if (indicesToQuery.length == 0) return;
+        DeleteByQueryRequest request = new DeleteByQueryRequest(indicesToQuery).setQuery(query)
             .setIndicesOptions(MlIndicesUtils.addIgnoreUnavailable(IndicesOptions.lenientExpandOpen()))
             .setAbortOnVersionConflict(false)
             .setRefresh(true);