[Failure store] Add failure index retrieval to IndexAbstraction

modules/data-streams/src/internalClusterTest/java/org/elasticsearch/datastreams/DataStreamIT.java

@@ -1920,7 +1920,7 @@ public ClusterState execute(ClusterState currentState) throws Exception {
                     DataStream original = currentState.getMetadata().dataStreams().get(dataStreamName);
                     DataStream broken = original.copy()
                         .setBackingIndices(
-                            original.getBackingIndices()
+                            original.getDataComponent()
                                 .copy()
                                 .setIndices(
                                     List.of(new Index(original.getIndices().get(0).getName(), "broken"), original.getIndices().get(1))

modules/data-streams/src/internalClusterTest/java/org/elasticsearch/datastreams/DataStreamsSnapshotsIT.java

@@ -148,7 +148,7 @@ public void setup() throws Exception {
         dsBackingIndexName = dataStreamInfos.get(0).getDataStream().getIndices().get(0).getName();
         otherDsBackingIndexName = dataStreamInfos.get(1).getDataStream().getIndices().get(0).getName();
         fsBackingIndexName = dataStreamInfos.get(2).getDataStream().getIndices().get(0).getName();
-        fsFailureIndexName = dataStreamInfos.get(2).getDataStream().getFailureIndices().getIndices().get(0).getName();
+        fsFailureIndexName = dataStreamInfos.get(2).getDataStream().getFailureIndices().get(0).getName();
 
         // Will be used in some tests, to test renaming while restoring a snapshot:
         ds2BackingIndexName = dsBackingIndexName.replace("-ds-", "-ds2-");
@@ -279,7 +279,7 @@ public void testSnapshotAndRestoreAllDataStreamsInPlace() throws Exception {
         assertThat(backingIndices.stream().map(Index::getName).collect(Collectors.toList()), contains(otherDsBackingIndexName));
         backingIndices = dataStreamInfos.get(2).getDataStream().getIndices();
         assertThat(backingIndices.stream().map(Index::getName).collect(Collectors.toList()), contains(fsBackingIndexName));
-        List<Index> failureIndices = dataStreamInfos.get(2).getDataStream().getFailureIndices().getIndices();
+        List<Index> failureIndices = dataStreamInfos.get(2).getDataStream().getFailureIndices();
         assertThat(failureIndices.stream().map(Index::getName).collect(Collectors.toList()), contains(fsFailureIndexName));
     }
 
@@ -375,7 +375,7 @@ public void testFailureStoreSnapshotAndRestore() throws Exception {
             assertEquals(1, dataStreamInfos.size());
             assertEquals(1, dataStreamInfos.get(0).getDataStream().getIndices().size());
             assertEquals(fsBackingIndexName, dataStreamInfos.get(0).getDataStream().getIndices().get(0).getName());
-            assertEquals(fsFailureIndexName, dataStreamInfos.get(0).getDataStream().getFailureIndices().getIndices().get(0).getName());
+            assertEquals(fsFailureIndexName, dataStreamInfos.get(0).getDataStream().getFailureIndices().get(0).getName());
         }
         {
             // With rename pattern
@@ -394,7 +394,7 @@ public void testFailureStoreSnapshotAndRestore() throws Exception {
             assertEquals(1, dataStreamInfos.size());
             assertEquals(1, dataStreamInfos.get(0).getDataStream().getIndices().size());
             assertEquals(fs2BackingIndexName, dataStreamInfos.get(0).getDataStream().getIndices().get(0).getName());
-            assertEquals(fs2FailureIndexName, dataStreamInfos.get(0).getDataStream().getFailureIndices().getIndices().get(0).getName());
+            assertEquals(fs2FailureIndexName, dataStreamInfos.get(0).getDataStream().getFailureIndices().get(0).getName());
         }
     }
 
@@ -587,8 +587,8 @@ public void testSnapshotAndRestoreAll() throws Exception {
         assertEquals(otherDsBackingIndexName, dataStreamInfos.get(1).getDataStream().getIndices().get(0).getName());
         assertEquals(1, dataStreamInfos.get(2).getDataStream().getIndices().size());
         assertEquals(fsBackingIndexName, dataStreamInfos.get(2).getDataStream().getIndices().get(0).getName());
-        assertEquals(1, dataStreamInfos.get(2).getDataStream().getFailureIndices().getIndices().size());
-        assertEquals(fsFailureIndexName, dataStreamInfos.get(2).getDataStream().getFailureIndices().getIndices().get(0).getName());
+        assertEquals(1, dataStreamInfos.get(2).getDataStream().getFailureIndices().size());
+        assertEquals(fsFailureIndexName, dataStreamInfos.get(2).getDataStream().getFailureIndices().get(0).getName());
 
         GetAliasesResponse getAliasesResponse = client.admin()
             .indices()
@@ -659,7 +659,7 @@ public void testSnapshotAndRestoreIncludeAliasesFalse() throws Exception {
         assertEquals(1, dataStreamInfos.get(2).getDataStream().getIndices().size());
         assertEquals(fsBackingIndexName, dataStreamInfos.get(2).getDataStream().getIndices().get(0).getName());
         assertEquals(1, dataStreamInfos.get(2).getDataStream().getIndices().size());
-        assertEquals(fsFailureIndexName, dataStreamInfos.get(2).getDataStream().getFailureIndices().getIndices().get(0).getName());
+        assertEquals(fsFailureIndexName, dataStreamInfos.get(2).getDataStream().getFailureIndices().get(0).getName());
 
         GetAliasesResponse getAliasesResponse = client.admin()
             .indices()
@@ -1257,8 +1257,8 @@ public void testExcludeDSFromSnapshotWhenExcludingAnyOfItsIndices() {
             assertThat(restoreSnapshotResponse.failedShards(), is(0));
 
             GetDataStreamAction.Response.DataStreamInfo dataStream = getDataStreamInfo(dataStreamName).getFirst();
-            assertThat(dataStream.getDataStream().getBackingIndices().getIndices(), not(empty()));
-            assertThat(dataStream.getDataStream().getFailureIndices().getIndices(), empty());
+            assertThat(dataStream.getDataStream().getDataComponent().getIndices(), not(empty()));
+            assertThat(dataStream.getDataStream().getFailureIndices(), empty());
         }
     }
 

modules/data-streams/src/internalClusterTest/java/org/elasticsearch/datastreams/LazyRolloverDuringDisruptionIT.java

@@ -58,7 +58,7 @@ public void testRolloverIsExecutedOnce() throws ExecutionException, InterruptedE
         // Verify that the data stream is marked for rollover and that it has currently one index
         DataStream dataStream = getDataStream(dataStreamName);
         assertThat(dataStream.rolloverOnWrite(), equalTo(true));
-        assertThat(dataStream.getBackingIndices().getIndices().size(), equalTo(1));
+        assertThat(dataStream.getDataComponent().getIndices().size(), equalTo(1));
 
         // Introduce a disruption to the master node that should delay the rollover execution
         final var barrier = new CyclicBarrier(2);
@@ -107,7 +107,7 @@ public void onFailure(Exception e) {
         // Verify that the rollover has happened once
         dataStream = getDataStream(dataStreamName);
         assertThat(dataStream.rolloverOnWrite(), equalTo(false));
-        assertThat(dataStream.getBackingIndices().getIndices().size(), equalTo(2));
+        assertThat(dataStream.getDataComponent().getIndices().size(), equalTo(2));
     }
 
     private DataStream getDataStream(String dataStreamName) {

modules/data-streams/src/internalClusterTest/java/org/elasticsearch/datastreams/LogsDataStreamIT.java

@@ -285,7 +285,7 @@ private void assertDataStreamBackingIndicesModes(final String dataStreamName, fi
         final GetDataStreamAction.Response getDataStreamResponse = client().execute(GetDataStreamAction.INSTANCE, getDataStreamRequest)
             .actionGet();
         final DataStream dataStream = getDataStreamResponse.getDataStreams().get(0).getDataStream();
-        final DataStream.DataStreamIndices backingIndices = dataStream.getBackingIndices();
+        final DataStream.DataStreamIndices backingIndices = dataStream.getDataComponent();
         final Iterator<IndexMode> indexModesIterator = modes.iterator();
         assertThat(backingIndices.getIndices().size(), Matchers.equalTo(modes.size()));
         for (final Index index : backingIndices.getIndices()) {

modules/data-streams/src/internalClusterTest/java/org/elasticsearch/datastreams/lifecycle/DataStreamLifecycleServiceIT.java

@@ -1084,7 +1084,7 @@ public void testLifecycleAppliedToFailureStore() throws Exception {
             assertThat(getDataStreamResponse.getDataStreams().get(0).getDataStream().getName(), equalTo(dataStreamName));
             List<Index> backingIndices = getDataStreamResponse.getDataStreams().get(0).getDataStream().getIndices();
             assertThat(backingIndices.size(), equalTo(1));
-            List<Index> failureIndices = getDataStreamResponse.getDataStreams().get(0).getDataStream().getFailureIndices().getIndices();
+            List<Index> failureIndices = getDataStreamResponse.getDataStreams().get(0).getDataStream().getFailureIndices();
             assertThat(failureIndices.size(), equalTo(2));
         });
 
@@ -1129,7 +1129,7 @@ public void testLifecycleAppliedToFailureStore() throws Exception {
             assertThat(getDataStreamResponse.getDataStreams().get(0).getDataStream().getName(), equalTo(dataStreamName));
             List<Index> backingIndices = getDataStreamResponse.getDataStreams().get(0).getDataStream().getIndices();
             assertThat(backingIndices.size(), equalTo(1));
-            List<Index> failureIndices = getDataStreamResponse.getDataStreams().get(0).getDataStream().getFailureIndices().getIndices();
+            List<Index> failureIndices = getDataStreamResponse.getDataStreams().get(0).getDataStream().getFailureIndices();
             assertThat(failureIndices.size(), equalTo(1));
             assertThat(failureIndices.get(0).getName(), equalTo(secondGenerationIndex));
         });
@@ -1156,14 +1156,7 @@ private static List<String> getFailureIndices(String dataStreamName) {
             .actionGet();
         assertThat(getDataStreamResponse.getDataStreams().size(), equalTo(1));
         assertThat(getDataStreamResponse.getDataStreams().get(0).getDataStream().getName(), equalTo(dataStreamName));
-        return getDataStreamResponse.getDataStreams()
-            .get(0)
-            .getDataStream()
-            .getFailureIndices()
-            .getIndices()
-            .stream()
-            .map(Index::getName)
-            .toList();
+        return getDataStreamResponse.getDataStreams().get(0).getDataStream().getFailureIndices().stream().map(Index::getName).toList();
     }
 
     static void indexDocs(String dataStream, int numDocs) {

modules/data-streams/src/main/java/org/elasticsearch/datastreams/action/DataStreamsStatsTransportAction.java

@@ -171,11 +171,11 @@ protected DataStreamsStatsAction.DataStreamShardStats readShardResult(StreamInpu
             if (indexAbstraction.getType() == IndexAbstraction.Type.DATA_STREAM) {
                 DataStream dataStream = (DataStream) indexAbstraction;
                 AggregatedStats stats = aggregatedDataStreamsStats.computeIfAbsent(dataStream.getName(), s -> new AggregatedStats());
-                dataStream.getBackingIndices().getIndices().stream().map(Index::getName).forEach(index -> {
+                dataStream.getIndices().stream().map(Index::getName).forEach(index -> {
                     stats.backingIndices.add(index);
                     allBackingIndices.add(index);
                 });
-                dataStream.getFailureIndices().getIndices().stream().map(Index::getName).forEach(index -> {
+                dataStream.getFailureIndices().stream().map(Index::getName).forEach(index -> {
                     stats.backingIndices.add(index);
                     allBackingIndices.add(index);
                 });

modules/data-streams/src/main/java/org/elasticsearch/datastreams/action/DeleteDataStreamTransportAction.java

@@ -156,7 +156,7 @@ static ClusterState removeDataStream(
             DataStream dataStream = currentState.metadata().dataStreams().get(dataStreamName);
             assert dataStream != null;
             backingIndicesToRemove.addAll(dataStream.getIndices());
-            backingIndicesToRemove.addAll(dataStream.getFailureIndices().getIndices());
+            backingIndicesToRemove.addAll(dataStream.getFailureIndices());
         }
 
         // first delete the data streams and then the indices:

modules/data-streams/src/main/java/org/elasticsearch/datastreams/action/TransportGetDataStreamsAction.java

@@ -207,8 +207,8 @@ static GetDataStreamAction.Response innerOperation(
             Map<Index, IndexProperties> backingIndicesSettingsValues = new HashMap<>();
             Metadata metadata = state.getMetadata();
             collectIndexSettingsValues(dataStream, backingIndicesSettingsValues, metadata, dataStream.getIndices());
-            if (DataStream.isFailureStoreFeatureFlagEnabled() && dataStream.getFailureIndices().getIndices().isEmpty() == false) {
-                collectIndexSettingsValues(dataStream, backingIndicesSettingsValues, metadata, dataStream.getFailureIndices().getIndices());
+            if (DataStream.isFailureStoreFeatureFlagEnabled() && dataStream.getFailureIndices().isEmpty() == false) {
+                collectIndexSettingsValues(dataStream, backingIndicesSettingsValues, metadata, dataStream.getFailureIndices());
             }
 
             GetDataStreamAction.Response.TimeSeries timeSeries = null;

modules/data-streams/src/main/java/org/elasticsearch/datastreams/lifecycle/DataStreamLifecycleService.java

@@ -762,10 +762,8 @@ static List<Index> getTargetIndices(
                 targetIndices.add(index);
             }
         }
-        if (withFailureStore
-            && DataStream.isFailureStoreFeatureFlagEnabled()
-            && dataStream.getFailureIndices().getIndices().isEmpty() == false) {
-            for (Index index : dataStream.getFailureIndices().getIndices()) {
+        if (withFailureStore && DataStream.isFailureStoreFeatureFlagEnabled() && dataStream.getFailureIndices().isEmpty() == false) {
+            for (Index index : dataStream.getFailureIndices()) {
                 if (dataStream.isIndexManagedByDataStreamLifecycle(index, indexMetadataSupplier)
                     && indicesToExcludeForRemainingRun.contains(index) == false) {
                     targetIndices.add(index);
@@ -820,7 +818,7 @@ private Set<Index> maybeExecuteRollover(ClusterState state, DataStream dataStrea
 
     @Nullable
     private Index maybeExecuteRollover(ClusterState state, DataStream dataStream, boolean rolloverFailureStore) {
-        Index currentRunWriteIndex = rolloverFailureStore ? dataStream.getFailureStoreWriteIndex() : dataStream.getWriteIndex();
+        Index currentRunWriteIndex = rolloverFailureStore ? dataStream.getWriteFailureIndex() : dataStream.getWriteIndex();
         if (currentRunWriteIndex == null) {
             return null;
         }

modules/data-streams/src/test/java/org/elasticsearch/datastreams/UpdateTimeSeriesRangeServiceTests.java

@@ -141,7 +141,7 @@ public void testUpdateTimeSeriesTemporalRange_NoUpdateBecauseReplicated() {
         ).getMetadata();
         DataStream d = metadata.dataStreams().get(dataStreamName);
         metadata = Metadata.builder(metadata)
-            .put(d.copy().setReplicated(true).setBackingIndices(d.getBackingIndices().copy().setRolloverOnWrite(false).build()).build())
+            .put(d.copy().setReplicated(true).setBackingIndices(d.getDataComponent().copy().setRolloverOnWrite(false).build()).build())
             .build();
 
         now = now.plus(1, ChronoUnit.HOURS);

modules/data-streams/src/test/java/org/elasticsearch/datastreams/lifecycle/DataStreamLifecycleServiceTests.java

@@ -238,7 +238,7 @@ public void testOperationsExecutedOnce() {
             .toList();
         assertThat(deleteRequests.get(0).indices()[0], is(dataStream.getIndices().get(0).getName()));
         assertThat(deleteRequests.get(1).indices()[0], is(dataStream.getIndices().get(1).getName()));
-        assertThat(deleteRequests.get(2).indices()[0], is(dataStream.getFailureIndices().getIndices().get(0).getName()));
+        assertThat(deleteRequests.get(2).indices()[0], is(dataStream.getFailureIndices().get(0).getName()));
 
         // on the second run the rollover and delete requests should not execute anymore
         // i.e. the count should *remain* 1 for rollover and 2 for deletes
@@ -1509,7 +1509,7 @@ public void testTargetIndices() {
         ).copy().setDataStreamOptions(dataStreamOptions).build(); // failure store is managed even when disabled
         builder.put(dataStream);
         Metadata metadata = builder.build();
-        Set<Index> indicesToExclude = Set.of(dataStream.getIndices().get(0), dataStream.getFailureIndices().getIndices().get(0));
+        Set<Index> indicesToExclude = Set.of(dataStream.getIndices().get(0), dataStream.getFailureIndices().get(0));
         List<Index> targetBackingIndicesOnly = DataStreamLifecycleService.getTargetIndices(
             dataStream,
             indicesToExclude,
@@ -1520,9 +1520,7 @@ public void testTargetIndices() {
         List<Index> targetIndices = DataStreamLifecycleService.getTargetIndices(dataStream, indicesToExclude, metadata::index, true);
         assertThat(
             targetIndices,
-            equalTo(
-                List.of(dataStream.getIndices().get(1), dataStream.getIndices().get(2), dataStream.getFailureIndices().getIndices().get(1))
-            )
+            equalTo(List.of(dataStream.getIndices().get(1), dataStream.getIndices().get(2), dataStream.getFailureIndices().get(1)))
         );
     }
 
@@ -1554,10 +1552,7 @@ public void testFailureStoreIsManagedEvenWhenDisabled() {
             rolloverFailureIndexRequest.getRolloverTarget(),
             is(IndexNameExpressionResolver.combineSelector(dataStreamName, IndexComponentSelector.FAILURES))
         );
-        assertThat(
-            ((DeleteIndexRequest) clientSeenRequests.get(2)).indices()[0],
-            is(dataStream.getFailureIndices().getIndices().get(0).getName())
-        );
+        assertThat(((DeleteIndexRequest) clientSeenRequests.get(2)).indices()[0], is(dataStream.getFailureIndices().get(0).getName()));
     }
 
     public void testMaybeExecuteRetentionSuccessfulDownsampledIndex() {

server/src/main/java/org/elasticsearch/action/admin/indices/create/AutoCreateAction.java

@@ -268,9 +268,9 @@ ClusterState execute(
 
                     final var dataStream = clusterState.metadata().dataStreams().get(request.index());
                     final var backingIndexName = dataStream.getIndices().get(0).getName();
-                    final var indexNames = dataStream.getFailureIndices().getIndices().isEmpty()
+                    final var indexNames = dataStream.getFailureIndices().isEmpty()
                         ? List.of(backingIndexName)
-                        : List.of(backingIndexName, dataStream.getFailureIndices().getIndices().get(0).getName());
+                        : List.of(backingIndexName, dataStream.getFailureIndices().get(0).getName());
                     taskContext.success(getAckListener(indexNames, allocationActionMultiListener));
                     successfulRequests.put(request, indexNames);
                     return clusterState;