Add temporary LegacyActionRequest (#128107)

In order to remove ActionType, ActionRequest will become strongly typed,
referring to the ActionResponse type. As a precursor to that, this
commit adds a LegacyActionRequest which all existing ActionRequest
implementations now inherit from. This will allow adding the
ActionResponse type to ActionRequest in a future commit without
modifying every implementation at once.

Author: rjernst

modules/ingest-common/src/main/java/org/elasticsearch/ingest/common/GrokProcessorGetAction.java

@@ -10,10 +10,10 @@
 
 import org.elasticsearch.TransportVersions;
 import org.elasticsearch.action.ActionListener;
-import org.elasticsearch.action.ActionRequest;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.ActionResponse;
 import org.elasticsearch.action.ActionType;
+import org.elasticsearch.action.LegacyActionRequest;
 import org.elasticsearch.action.support.ActionFilters;
 import org.elasticsearch.action.support.HandledTransportAction;
 import org.elasticsearch.client.internal.node.NodeClient;
@@ -43,11 +43,11 @@
 
 public class GrokProcessorGetAction {
 
-    static final ActionType<GrokProcessorGetAction.Response> INSTANCE = new ActionType<>("cluster:admin/ingest/processor/grok/get");
+    static final ActionType<Response> INSTANCE = new ActionType<>("cluster:admin/ingest/processor/grok/get");
 
     private GrokProcessorGetAction() {/* no instances */}
 
-    public static class Request extends ActionRequest {
+    public static class Request extends LegacyActionRequest {
 
         private final boolean sorted;
         private final String ecsCompatibility;

modules/lang-mustache/src/main/java/org/elasticsearch/script/mustache/MultiSearchTemplateRequest.java

@@ -9,9 +9,9 @@
 
 package org.elasticsearch.script.mustache;
 
-import org.elasticsearch.action.ActionRequest;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.CompositeIndicesRequest;
+import org.elasticsearch.action.LegacyActionRequest;
 import org.elasticsearch.action.search.MultiSearchRequest;
 import org.elasticsearch.action.search.SearchRequest;
 import org.elasticsearch.action.support.IndicesOptions;
@@ -30,7 +30,7 @@
 
 import static org.elasticsearch.action.ValidateActions.addValidationError;
 
-public class MultiSearchTemplateRequest extends ActionRequest implements CompositeIndicesRequest {
+public class MultiSearchTemplateRequest extends LegacyActionRequest implements CompositeIndicesRequest {
 
     private int maxConcurrentSearchRequests = 0;
     private List<SearchTemplateRequest> requests = new ArrayList<>();

modules/lang-mustache/src/main/java/org/elasticsearch/script/mustache/SearchTemplateRequest.java

@@ -9,9 +9,9 @@
 
 package org.elasticsearch.script.mustache;
 
-import org.elasticsearch.action.ActionRequest;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.CompositeIndicesRequest;
+import org.elasticsearch.action.LegacyActionRequest;
 import org.elasticsearch.action.search.SearchRequest;
 import org.elasticsearch.common.ParsingException;
 import org.elasticsearch.common.Strings;
@@ -34,7 +34,7 @@
 /**
  * A request to execute a search based on a search template.
  */
-public class SearchTemplateRequest extends ActionRequest implements CompositeIndicesRequest, ToXContentObject {
+public class SearchTemplateRequest extends LegacyActionRequest implements CompositeIndicesRequest, ToXContentObject {
 
     private SearchRequest request;
     private boolean simulate = false;
@@ -171,6 +171,7 @@ public ActionRequestValidationException validate() {
     private static final ParseField PROFILE_FIELD = new ParseField("profile");
 
     private static final ObjectParser<SearchTemplateRequest, Void> PARSER;
+
     static {
         PARSER = new ObjectParser<>("search_template");
         PARSER.declareField((parser, request, s) -> request.setScriptParams(parser.map()), PARAMS_FIELD, ObjectParser.ValueType.OBJECT);

modules/lang-painless/src/main/java/org/elasticsearch/painless/action/PainlessContextAction.java

@@ -10,10 +10,10 @@
 package org.elasticsearch.painless.action;
 
 import org.elasticsearch.action.ActionListener;
-import org.elasticsearch.action.ActionRequest;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.ActionResponse;
 import org.elasticsearch.action.ActionType;
+import org.elasticsearch.action.LegacyActionRequest;
 import org.elasticsearch.action.support.ActionFilters;
 import org.elasticsearch.action.support.HandledTransportAction;
 import org.elasticsearch.client.internal.node.NodeClient;
@@ -61,7 +61,7 @@ public class PainlessContextAction {
 
     private PainlessContextAction() {/* no instances */}
 
-    public static class Request extends ActionRequest {
+    public static class Request extends LegacyActionRequest {
 
         private String scriptContextName;
 

modules/rank-eval/src/main/java/org/elasticsearch/index/rankeval/RankEvalRequest.java

@@ -9,9 +9,9 @@
 
 package org.elasticsearch.index.rankeval;
 
-import org.elasticsearch.action.ActionRequest;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.IndicesRequest;
+import org.elasticsearch.action.LegacyActionRequest;
 import org.elasticsearch.action.search.SearchRequest;
 import org.elasticsearch.action.search.SearchType;
 import org.elasticsearch.action.support.IndicesOptions;
@@ -26,7 +26,7 @@
 /**
  * Request to perform a search ranking evaluation.
  */
-public final class RankEvalRequest extends ActionRequest implements IndicesRequest.Replaceable {
+public final class RankEvalRequest extends LegacyActionRequest implements IndicesRequest.Replaceable {
 
     private RankEvalSpec rankingEvaluationSpec;
 

modules/rest-root/src/main/java/org/elasticsearch/rest/root/MainRequest.java

@@ -9,14 +9,14 @@
 
 package org.elasticsearch.rest.root;
 
-import org.elasticsearch.action.ActionRequest;
 import org.elasticsearch.action.ActionRequestValidationException;
+import org.elasticsearch.action.LegacyActionRequest;
 import org.elasticsearch.action.support.TransportAction;
 import org.elasticsearch.common.io.stream.StreamOutput;
 
 import java.io.IOException;
 
-public class MainRequest extends ActionRequest {
+public class MainRequest extends LegacyActionRequest {
     @Override
     public ActionRequestValidationException validate() {
         return null;

modules/transport-netty4/src/internalClusterTest/java/org/elasticsearch/http/netty4/Netty4ChunkedContinuationsIT.java

@@ -15,11 +15,11 @@
 import org.elasticsearch.ESNetty4IntegTestCase;
 import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.action.ActionListener;
-import org.elasticsearch.action.ActionRequest;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.ActionResponse;
 import org.elasticsearch.action.ActionRunnable;
 import org.elasticsearch.action.ActionType;
+import org.elasticsearch.action.LegacyActionRequest;
 import org.elasticsearch.action.support.ActionFilters;
 import org.elasticsearch.action.support.CountDownActionListener;
 import org.elasticsearch.action.support.SubscribableListener;
@@ -337,14 +337,14 @@ public static class YieldsContinuationsPlugin extends Plugin implements ActionPl
         static final String ROUTE = "/_test/yields_continuations";
         static final String FAIL_INDEX_PARAM = "fail_index";
 
-        private static final ActionType<YieldsContinuationsPlugin.Response> TYPE = new ActionType<>("test:yields_continuations");
+        private static final ActionType<Response> TYPE = new ActionType<>("test:yields_continuations");
 
         @Override
         public Collection<ActionHandler> getActions() {
             return List.of(new ActionHandler(TYPE, TransportYieldsContinuationsAction.class));
         }
 
-        public static class Request extends ActionRequest {
+        public static class Request extends LegacyActionRequest {
             final int failIndex;
 
             public Request(int failIndex) {
@@ -525,7 +525,7 @@ public Collection<ActionHandler> getActions() {
             return List.of(new ActionHandler(TYPE, TransportInfiniteContinuationsAction.class));
         }
 
-        public static class Request extends ActionRequest {
+        public static class Request extends LegacyActionRequest {
             @Override
             public ActionRequestValidationException validate() {
                 return null;

server/src/internalClusterTest/java/org/elasticsearch/action/admin/cluster/node/tasks/CancellableTasksIT.java

@@ -14,11 +14,11 @@
 import org.elasticsearch.action.ActionFuture;
 import org.elasticsearch.action.ActionListener;
 import org.elasticsearch.action.ActionListenerResponseHandler;
-import org.elasticsearch.action.ActionRequest;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.ActionResponse;
 import org.elasticsearch.action.ActionType;
 import org.elasticsearch.action.LatchedActionListener;
+import org.elasticsearch.action.LegacyActionRequest;
 import org.elasticsearch.action.admin.cluster.node.tasks.list.ListTasksResponse;
 import org.elasticsearch.action.support.ActionFilters;
 import org.elasticsearch.action.support.GroupedActionListener;
@@ -118,6 +118,7 @@ static void randomDescendants(TestRequest request, Set<TestRequest> result) {
 
     /**
      * Allow some parts of the request to be completed
+     *
      * @return a pending child requests
      */
     static Set<TestRequest> allowPartialRequest(TestRequest request) throws Exception {
@@ -418,7 +419,7 @@ static void waitForRootTask(ActionFuture<TestResponse> rootTask, boolean expectT
         }
     }
 
-    static class TestRequest extends ActionRequest {
+    static class TestRequest extends LegacyActionRequest {
         final int id;
         final DiscoveryNode node;
         final List<TestRequest> subRequests;

server/src/internalClusterTest/java/org/elasticsearch/action/admin/cluster/tasks/ListTasksIT.java

@@ -10,11 +10,11 @@
 package org.elasticsearch.action.admin.cluster.tasks;
 
 import org.elasticsearch.action.ActionListener;
-import org.elasticsearch.action.ActionRequest;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.ActionResponse;
 import org.elasticsearch.action.ActionRunnable;
 import org.elasticsearch.action.ActionType;
+import org.elasticsearch.action.LegacyActionRequest;
 import org.elasticsearch.action.support.ActionFilters;
 import org.elasticsearch.action.support.HandledTransportAction;
 import org.elasticsearch.action.support.PlainActionFuture;
@@ -142,7 +142,7 @@ public List<ActionHandler> getActions() {
         }
     }
 
-    public static class TestRequest extends ActionRequest {
+    public static class TestRequest extends LegacyActionRequest {
         @Override
         public ActionRequestValidationException validate() {
             return null;

server/src/internalClusterTest/java/org/elasticsearch/search/rank/MockedRequestActionBasedRerankerIT.java

@@ -16,10 +16,10 @@
 import org.elasticsearch.TransportVersion;
 import org.elasticsearch.TransportVersions;
 import org.elasticsearch.action.ActionListener;
-import org.elasticsearch.action.ActionRequest;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.ActionResponse;
 import org.elasticsearch.action.ActionType;
+import org.elasticsearch.action.LegacyActionRequest;
 import org.elasticsearch.action.search.SearchPhaseController;
 import org.elasticsearch.action.support.ActionFilters;
 import org.elasticsearch.action.support.HandledTransportAction;
@@ -142,7 +142,7 @@ public static class TestRerankingActionType extends ActionType<TestRerankingActi
         }
     }
 
-    public static class TestRerankingActionRequest extends ActionRequest {
+    public static class TestRerankingActionRequest extends LegacyActionRequest {
 
         private final List<String> docFeatures;
 

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

@@ -0,0 +1,30 @@
+/*
+ * 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", the "GNU Affero General Public License v3.0 only", 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", the "GNU Affero General Public
+ * License v3.0 only", or the "Server Side Public License, v 1".
+ */
+
+package org.elasticsearch.action;
+
+import org.elasticsearch.common.io.stream.StreamInput;
+
+import java.io.IOException;
+
+/**
+ * An action request with an unspecified response type.
+ *
+ * @deprecated Use {@link ActionRequest} with a specific {@link ActionResponse} type.
+ */
+@Deprecated
+public abstract class LegacyActionRequest extends ActionRequest {
+    public LegacyActionRequest() {
+        super();
+    }
+
+    public LegacyActionRequest(StreamInput in) throws IOException {
+        super(in);
+    }
+}

server/src/main/java/org/elasticsearch/action/admin/cluster/coordination/ClusterFormationInfoAction.java

@@ -10,10 +10,10 @@
 package org.elasticsearch.action.admin.cluster.coordination;
 
 import org.elasticsearch.action.ActionListener;
-import org.elasticsearch.action.ActionRequest;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.ActionResponse;
 import org.elasticsearch.action.ActionType;
+import org.elasticsearch.action.LegacyActionRequest;
 import org.elasticsearch.action.support.ActionFilters;
 import org.elasticsearch.action.support.HandledTransportAction;
 import org.elasticsearch.cluster.coordination.ClusterFormationFailureHelper;
@@ -41,7 +41,7 @@ private ClusterFormationInfoAction() {
         super(NAME);
     }
 
-    public static class Request extends ActionRequest {
+    public static class Request extends LegacyActionRequest {
 
         public Request() {}
 
@@ -105,7 +105,7 @@ public boolean equals(Object o) {
             if (o == null || getClass() != o.getClass()) {
                 return false;
             }
-            ClusterFormationInfoAction.Response response = (ClusterFormationInfoAction.Response) o;
+            Response response = (Response) o;
             return clusterFormationState.equals(response.clusterFormationState);
         }
 
@@ -118,9 +118,7 @@ public int hashCode() {
     /**
      * This transport action fetches the ClusterFormationState from a remote node.
      */
-    public static class TransportAction extends HandledTransportAction<
-        ClusterFormationInfoAction.Request,
-        ClusterFormationInfoAction.Response> {
+    public static class TransportAction extends HandledTransportAction<Request, Response> {
         private final Coordinator coordinator;
 
         @Inject
@@ -129,19 +127,15 @@ public TransportAction(TransportService transportService, ActionFilters actionFi
                 ClusterFormationInfoAction.NAME,
                 transportService,
                 actionFilters,
-                ClusterFormationInfoAction.Request::new,
+                Request::new,
                 transportService.getThreadPool().executor(ThreadPool.Names.CLUSTER_COORDINATION)
             );
             this.coordinator = coordinator;
         }
 
         @Override
-        protected void doExecute(
-            Task task,
-            ClusterFormationInfoAction.Request request,
-            ActionListener<ClusterFormationInfoAction.Response> listener
-        ) {
-            listener.onResponse(new ClusterFormationInfoAction.Response(coordinator.getClusterFormationState()));
+        protected void doExecute(Task task, Request request, ActionListener<Response> listener) {
+            listener.onResponse(new Response(coordinator.getClusterFormationState()));
         }
     }
 

server/src/main/java/org/elasticsearch/action/admin/cluster/coordination/CoordinationDiagnosticsAction.java

@@ -10,10 +10,10 @@
 package org.elasticsearch.action.admin.cluster.coordination;
 
 import org.elasticsearch.action.ActionListener;
-import org.elasticsearch.action.ActionRequest;
 import org.elasticsearch.action.ActionRequestValidationException;
 import org.elasticsearch.action.ActionResponse;
 import org.elasticsearch.action.ActionType;
+import org.elasticsearch.action.LegacyActionRequest;
 import org.elasticsearch.action.support.ActionFilters;
 import org.elasticsearch.action.support.HandledTransportAction;
 import org.elasticsearch.cluster.coordination.CoordinationDiagnosticsService;
@@ -42,7 +42,7 @@ private CoordinationDiagnosticsAction() {
         super(NAME);
     }
 
-    public static class Request extends ActionRequest {
+    public static class Request extends LegacyActionRequest {
         final boolean explain; // Non-private for testing
 
         public Request(boolean explain) {
@@ -104,7 +104,7 @@ public void writeTo(StreamOutput out) throws IOException {
         public boolean equals(Object o) {
             if (this == o) return true;
             if (o == null || getClass() != o.getClass()) return false;
-            CoordinationDiagnosticsAction.Response response = (CoordinationDiagnosticsAction.Response) o;
+            Response response = (Response) o;
             return result.equals(response.result);
         }
 
@@ -130,14 +130,14 @@ public TransportAction(
                 CoordinationDiagnosticsAction.NAME,
                 transportService,
                 actionFilters,
-                CoordinationDiagnosticsAction.Request::new,
+                Request::new,
                 transportService.getThreadPool().executor(ThreadPool.Names.CLUSTER_COORDINATION)
             );
             this.coordinationDiagnosticsService = coordinationDiagnosticsService;
         }
 
         @Override
-        protected void doExecute(Task task, CoordinationDiagnosticsAction.Request request, ActionListener<Response> listener) {
+        protected void doExecute(Task task, Request request, ActionListener<Response> listener) {
             listener.onResponse(new Response(coordinationDiagnosticsService.diagnoseMasterStability(request.explain)));
         }
     }