Incremental bulk integration with rest layer

modules/transport-netty4/src/main/java/org/elasticsearch/http/netty4/Netty4HttpRequestBodyStream.java

@@ -28,7 +28,7 @@ public class Netty4HttpRequestBodyStream implements HttpBody.Stream {
 
     private final Channel channel;
     private final Queue<HttpContent> chunkQueue = new ArrayDeque<>();
-    private boolean requested = false;
+    private boolean requested = true;
     private boolean hasLast = false;
     private HttpBody.ChunkHandler handler;
 

modules/transport-netty4/src/main/java/org/elasticsearch/http/netty4/Netty4HttpServerTransport.java

@@ -36,6 +36,7 @@
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.elasticsearch.ExceptionsHelper;
+import org.elasticsearch.action.bulk.IncrementalBulkService;
 import org.elasticsearch.common.network.CloseableChannel;
 import org.elasticsearch.common.network.NetworkService;
 import org.elasticsearch.common.network.ThreadWatchdog;
@@ -96,6 +97,7 @@ public class Netty4HttpServerTransport extends AbstractHttpServerTransport {
     private final TLSConfig tlsConfig;
     private final AcceptChannelHandler.AcceptPredicate acceptChannelPredicate;
     private final HttpValidator httpValidator;
+    private final IncrementalBulkService.Enabled enabled;
     private final ThreadWatchdog threadWatchdog;
     private final int readTimeoutMillis;
 
@@ -134,6 +136,7 @@ public Netty4HttpServerTransport(
         this.acceptChannelPredicate = acceptChannelPredicate;
         this.httpValidator = httpValidator;
         this.threadWatchdog = networkService.getThreadWatchdog();
+        this.enabled = new IncrementalBulkService.Enabled(clusterSettings);
 
         this.pipeliningMaxEvents = SETTING_PIPELINING_MAX_EVENTS.get(settings);
 
@@ -279,7 +282,7 @@ public void onException(HttpChannel channel, Exception cause) {
     }
 
     public ChannelHandler configureServerChannelHandler() {
-        return new HttpChannelHandler(this, handlingSettings, tlsConfig, acceptChannelPredicate, httpValidator);
+        return new HttpChannelHandler(this, handlingSettings, tlsConfig, acceptChannelPredicate, httpValidator, enabled);
     }
 
     static final AttributeKey<Netty4HttpChannel> HTTP_CHANNEL_KEY = AttributeKey.newInstance("es-http-channel");
@@ -292,19 +295,22 @@ protected static class HttpChannelHandler extends ChannelInitializer<Channel> {
         private final TLSConfig tlsConfig;
         private final BiPredicate<String, InetSocketAddress> acceptChannelPredicate;
         private final HttpValidator httpValidator;
+        private final IncrementalBulkService.Enabled enabled;
 
         protected HttpChannelHandler(
             final Netty4HttpServerTransport transport,
             final HttpHandlingSettings handlingSettings,
             final TLSConfig tlsConfig,
             @Nullable final BiPredicate<String, InetSocketAddress> acceptChannelPredicate,
-            @Nullable final HttpValidator httpValidator
+            @Nullable final HttpValidator httpValidator,
+            IncrementalBulkService.Enabled enabled
         ) {
             this.transport = transport;
             this.handlingSettings = handlingSettings;
             this.tlsConfig = tlsConfig;
             this.acceptChannelPredicate = acceptChannelPredicate;
             this.httpValidator = httpValidator;
+            this.enabled = enabled;
         }
 
         @Override
@@ -365,7 +371,10 @@ protected HttpMessage createMessage(String[] initialLine) throws Exception {
                     );
             }
             // combines the HTTP message pieces into a single full HTTP request (with headers and body)
-            final HttpObjectAggregator aggregator = new Netty4HttpAggregator(handlingSettings.maxContentLength());
+            final HttpObjectAggregator aggregator = new Netty4HttpAggregator(
+                handlingSettings.maxContentLength(),
+                httpPreRequest -> enabled.incrementalBulkEnabled() && httpPreRequest.uri().contains("_bulk") == false
+            );
             aggregator.setMaxCumulationBufferComponents(transport.maxCompositeBufferComponents);
             ch.pipeline()
                 .addLast("decoder_compress", new HttpContentDecompressor()) // this handles request body decompression

modules/transport-netty4/src/test/java/org/elasticsearch/http/netty4/Netty4HttpServerTransportTests.java

@@ -45,6 +45,7 @@
 import org.elasticsearch.ElasticsearchSecurityException;
 import org.elasticsearch.ElasticsearchWrapperException;
 import org.elasticsearch.action.ActionListener;
+import org.elasticsearch.action.bulk.IncrementalBulkService;
 import org.elasticsearch.action.support.ActionTestUtils;
 import org.elasticsearch.action.support.SubscribableListener;
 import org.elasticsearch.client.Request;
@@ -418,7 +419,8 @@ public ChannelHandler configureServerChannelHandler() {
                         handlingSettings,
                         TLSConfig.noTLS(),
                         null,
-                        randomFrom((httpPreRequest, channel, listener) -> listener.onResponse(null), null)
+                        randomFrom((httpPreRequest, channel, listener) -> listener.onResponse(null), null),
+                        new IncrementalBulkService.Enabled(clusterSettings)
                     ) {
                         @Override
                         protected void initChannel(Channel ch) throws Exception {

qa/smoke-test-http/src/javaRestTest/java/org/elasticsearch/http/IncrementalBulkRestIT.java

@@ -0,0 +1,96 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License
+ * 2.0 and the Server Side Public License, v 1; you may not use this file except
+ * in compliance with, at your election, the Elastic License 2.0 or the Server
+ * Side Public License, v 1.
+ */
+
+package org.elasticsearch.http;
+
+import org.elasticsearch.client.Request;
+import org.elasticsearch.client.Response;
+import org.elasticsearch.client.ResponseException;
+import org.elasticsearch.common.xcontent.XContentHelper;
+import org.elasticsearch.test.ESIntegTestCase;
+import org.elasticsearch.xcontent.json.JsonXContent;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Map;
+
+import static org.elasticsearch.rest.RestStatus.OK;
+import static org.hamcrest.Matchers.equalTo;
+
+@ESIntegTestCase.ClusterScope(scope = ESIntegTestCase.Scope.SUITE, supportsDedicatedMasters = false, numDataNodes = 2, numClientNodes = 0)
+public class IncrementalBulkRestIT extends HttpSmokeTestCase {
+
+    @SuppressWarnings("unchecked")
+    public void testIncrementalBulk() throws IOException {
+        Request createRequest = new Request("PUT", "/index_name");
+        createRequest.setJsonEntity("""
+            {
+              "settings": {
+                "index": {
+                  "number_of_shards": 1,
+                  "number_of_replicas": 1,
+                  "write.wait_for_active_shards": 2
+                }
+              }
+            }""");
+        final Response indexCreatedResponse = getRestClient().performRequest(createRequest);
+        assertThat(indexCreatedResponse.getStatusLine().getStatusCode(), equalTo(OK.getStatus()));
+
+        Request successfulIndexingRequest = new Request("POST", "/index_name/_bulk");
+
+        // index documents for the rollup job
+        final StringBuilder bulk = new StringBuilder();
+        for (int i = 0; i < 1000; i++) {
+            bulk.append("{\"index\":{\"_index\":\"index_name\"}}\n");
+            bulk.append("{\"field\":").append(i).append("}\n");
+        }
+        bulk.append("\r\n");
+
+        successfulIndexingRequest.setJsonEntity(bulk.toString());
+
+        final Response indexSuccessFul = getRestClient().performRequest(successfulIndexingRequest);
+        assertThat(indexSuccessFul.getStatusLine().getStatusCode(), equalTo(OK.getStatus()));
+        Map<String, Object> responseMap = XContentHelper.convertToMap(
+            JsonXContent.jsonXContent,
+            indexSuccessFul.getEntity().getContent(),
+            true
+        );
+
+        assertFalse((Boolean) responseMap.get("errors"));
+        assertThat(((List<Object>) responseMap.get("items")).size(), equalTo(1000));
+    }
+
+    public void testIncrementalMalformed() throws IOException {
+        Request createRequest = new Request("PUT", "/index_name");
+        createRequest.setJsonEntity("""
+            {
+              "settings": {
+                "index": {
+                  "number_of_shards": 1,
+                  "number_of_replicas": 1,
+                  "write.wait_for_active_shards": 2
+                }
+              }
+            }""");
+        final Response indexCreatedResponse = getRestClient().performRequest(createRequest);
+        assertThat(indexCreatedResponse.getStatusLine().getStatusCode(), equalTo(OK.getStatus()));
+
+        Request bulkRequest = new Request("POST", "/index_name/_bulk");
+
+        // index documents for the rollup job
+        final StringBuilder bulk = new StringBuilder();
+        bulk.append("{\"index\":{\"_index\":\"index_name\"}}\n");
+        bulk.append("{\"field\":1}\n");
+        bulk.append("{}\n");
+        bulk.append("\r\n");
+
+        bulkRequest.setJsonEntity(bulk.toString());
+
+        expectThrows(ResponseException.class, () -> getRestClient().performRequest(bulkRequest));
+    }
+}

server/src/main/java/org/elasticsearch/action/ActionModule.java

@@ -159,6 +159,7 @@
 import org.elasticsearch.action.admin.indices.template.put.TransportPutIndexTemplateAction;
 import org.elasticsearch.action.admin.indices.validate.query.TransportValidateQueryAction;
 import org.elasticsearch.action.admin.indices.validate.query.ValidateQueryAction;
+import org.elasticsearch.action.bulk.IncrementalBulkService;
 import org.elasticsearch.action.bulk.SimulateBulkAction;
 import org.elasticsearch.action.bulk.TransportBulkAction;
 import org.elasticsearch.action.bulk.TransportShardBulkAction;
@@ -447,6 +448,7 @@ public class ActionModule extends AbstractModule {
     private final List<ActionPlugin> actionPlugins;
     private final Map<String, ActionHandler<?, ?>> actions;
     private final ActionFilters actionFilters;
+    private final IncrementalBulkService bulkService;
     private final AutoCreateIndex autoCreateIndex;
     private final DestructiveOperations destructiveOperations;
     private final RestController restController;
@@ -475,7 +477,8 @@ public ActionModule(
         ClusterService clusterService,
         RerouteService rerouteService,
         List<ReservedClusterStateHandler<?>> reservedStateHandlers,
-        RestExtension restExtension
+        RestExtension restExtension,
+        IncrementalBulkService bulkService
     ) {
         this.settings = settings;
         this.indexNameExpressionResolver = indexNameExpressionResolver;
@@ -487,6 +490,7 @@ public ActionModule(
         this.threadPool = threadPool;
         actions = setupActions(actionPlugins);
         actionFilters = setupActionFilters(actionPlugins);
+        this.bulkService = bulkService;
         autoCreateIndex = new AutoCreateIndex(settings, clusterSettings, indexNameExpressionResolver, systemIndices);
         destructiveOperations = new DestructiveOperations(settings, clusterSettings);
         Set<RestHeaderDefinition> headers = Stream.concat(
@@ -927,7 +931,7 @@ public void initRestHandlers(Supplier<DiscoveryNodes> nodesInCluster, Predicate<
         registerHandler.accept(new RestCountAction());
         registerHandler.accept(new RestTermVectorsAction());
         registerHandler.accept(new RestMultiTermVectorsAction());
-        registerHandler.accept(new RestBulkAction(settings));
+        registerHandler.accept(new RestBulkAction(settings, bulkService));
         registerHandler.accept(new RestUpdateAction());
 
         registerHandler.accept(new RestSearchAction(restController.getSearchUsageHolder(), clusterSupportsFeature));

server/src/main/java/org/elasticsearch/action/bulk/BulkRequestParser.java

@@ -85,13 +85,13 @@ public BulkRequestParser(boolean deprecateOrErrorOnType, RestApiVersion restApiV
             .withRestApiVersion(restApiVersion);
     }
 
-    private static int findNextMarker(byte marker, int from, BytesReference data) {
+    private static int findNextMarker(byte marker, int from, BytesReference data, boolean isIncremental) {
         final int res = data.indexOf(marker, from);
         if (res != -1) {
             assert res >= 0;
             return res;
         }
-        if (from != data.length()) {
+        if (from != data.length() && isIncremental == false) {
             throw new IllegalArgumentException("The bulk request must be terminated by a newline [\\n]");
         }
         return res;
@@ -136,18 +136,57 @@ public void parse(
         Consumer<UpdateRequest> updateRequestConsumer,
         Consumer<DeleteRequest> deleteRequestConsumer
     ) throws IOException {
-        XContent xContent = xContentType.xContent();
-        int line = 0;
-        int from = 0;
-        byte marker = xContent.bulkSeparator();
         // Bulk requests can contain a lot of repeated strings for the index, pipeline and routing parameters. This map is used to
         // deduplicate duplicate strings parsed for these parameters. While it does not prevent instantiating the duplicate strings, it
         // reduces their lifetime to the lifetime of this parse call instead of the lifetime of the full bulk request.
         final Map<String, String> stringDeduplicator = new HashMap<>();
+
+        incrementalParse(
+            data,
+            defaultIndex,
+            defaultRouting,
+            defaultFetchSourceContext,
+            defaultPipeline,
+            defaultRequireAlias,
+            defaultRequireDataStream,
+            defaultListExecutedPipelines,
+            allowExplicitIndex,
+            xContentType,
+            indexRequestConsumer,
+            updateRequestConsumer,
+            deleteRequestConsumer,
+            false,
+            stringDeduplicator
+        );
+    }
+
+    public int incrementalParse(
+        BytesReference data,
+        String defaultIndex,
+        String defaultRouting,
+        FetchSourceContext defaultFetchSourceContext,
+        String defaultPipeline,
+        Boolean defaultRequireAlias,
+        Boolean defaultRequireDataStream,
+        Boolean defaultListExecutedPipelines,
+        boolean allowExplicitIndex,
+        XContentType xContentType,
+        BiConsumer<IndexRequest, String> indexRequestConsumer,
+        Consumer<UpdateRequest> updateRequestConsumer,
+        Consumer<DeleteRequest> deleteRequestConsumer,
+        boolean isIncremental,
+        Map<String, String> stringDeduplicator
+    ) throws IOException {
+        XContent xContent = xContentType.xContent();
+        byte marker = xContent.bulkSeparator();
         boolean typesDeprecationLogged = false;
 
+        int line = 0;
+        int from = 0;
+        int consumed = 0;
+
         while (true) {
-            int nextMarker = findNextMarker(marker, from, data);
+            int nextMarker = findNextMarker(marker, from, data, isIncremental);
             if (nextMarker == -1) {
                 break;
             }
@@ -332,8 +371,9 @@ public void parse(
                             .setIfSeqNo(ifSeqNo)
                             .setIfPrimaryTerm(ifPrimaryTerm)
                     );
+                    consumed = from;
                 } else {
-                    nextMarker = findNextMarker(marker, from, data);
+                    nextMarker = findNextMarker(marker, from, data, isIncremental);
                     if (nextMarker == -1) {
                         break;
                     }
@@ -406,9 +446,11 @@ public void parse(
                     }
                     // move pointers
                     from = nextMarker + 1;
+                    consumed = from;
                 }
             }
         }
+        return isIncremental ? consumed : from;
     }
 
     @UpdateForV9