Run TransportGetComposableIndexTemplate on local node (#119830)

This action solely needs the cluster state, it can run on any node.
Additionally, it needs to be cancellable to avoid doing unnecessary work
after a client failure or timeout.

As a drive-by, this removes another usage of the trappy default master
node timeout.

docs/changelog/119830.yaml

@@ -0,0 +1,5 @@
+pr: 119830
+summary: Run `TransportGetComposableIndexTemplate` on local node
+area: Indices APIs
+type: enhancement
+issues: []

docs/reference/indices/get-index-template.asciidoc

@@ -65,7 +65,7 @@ expressions. If omitted, all templates are returned.
 
 include::{docdir}/rest-api/common-parms.asciidoc[tag=flat-settings]
 
-include::{docdir}/rest-api/common-parms.asciidoc[tag=local]
+include::{docdir}/rest-api/common-parms.asciidoc[tag=local-deprecated-9.0.0]
 
 include::{docdir}/rest-api/common-parms.asciidoc[tag=master-timeout]
 

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

@@ -722,7 +722,7 @@ public void testCannotDeleteComposableTemplateUsedByDataStream() throws Exceptio
         TransportDeleteComposableIndexTemplateAction.Request deleteRequest = new TransportDeleteComposableIndexTemplateAction.Request("id");
         client().execute(TransportDeleteComposableIndexTemplateAction.TYPE, deleteRequest).get();
 
-        GetComposableIndexTemplateAction.Request getReq = new GetComposableIndexTemplateAction.Request("id");
+        GetComposableIndexTemplateAction.Request getReq = new GetComposableIndexTemplateAction.Request(TEST_REQUEST_TIMEOUT, "id");
         Exception e3 = expectThrows(Exception.class, client().execute(GetComposableIndexTemplateAction.INSTANCE, getReq));
         maybeE = ExceptionsHelper.unwrapCausesAndSuppressed(e3, err -> err.getMessage().contains("index template matching [id] not found"));
         assertTrue(maybeE.isPresent());

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

@@ -16,6 +16,7 @@
 import org.elasticsearch.action.admin.indices.alias.get.GetAliasesAction;
 import org.elasticsearch.action.admin.indices.recovery.RecoveryAction;
 import org.elasticsearch.action.admin.indices.template.get.GetComponentTemplateAction;
+import org.elasticsearch.action.admin.indices.template.get.GetComposableIndexTemplateAction;
 import org.elasticsearch.action.support.CancellableActionTestPlugin;
 import org.elasticsearch.action.support.PlainActionFuture;
 import org.elasticsearch.action.support.RefCountingListener;
@@ -71,6 +72,10 @@ public void testGetComponentTemplateCancellation() {
         runRestActionCancellationTest(new Request(HttpGet.METHOD_NAME, "/_component_template"), GetComponentTemplateAction.NAME);
     }
 
+    public void testGetComposableTemplateCancellation() {
+        runRestActionCancellationTest(new Request(HttpGet.METHOD_NAME, "/_index_template"), GetComposableIndexTemplateAction.NAME);
+    }
+
     private void runRestActionCancellationTest(Request request, String actionName) {
         final var node = usually() ? internalCluster().getRandomNodeName() : internalCluster().startCoordinatingOnlyNode(Settings.EMPTY);
 

rest-api-spec/src/main/resources/rest-api-spec/api/indices.exists_template.json

@@ -32,9 +32,10 @@
       },
       "master_timeout":{
         "type":"time",
-        "description":"Explicit operation timeout for connection to master node"
+        "description":"Timeout for waiting for new cluster state in case it is blocked"
       },
       "local":{
+        "deprecated":true,
         "type":"boolean",
         "description":"Return local information, do not retrieve the state from master node (default: false)"
       }

rest-api-spec/src/main/resources/rest-api-spec/api/indices.get_index_template.json

@@ -38,9 +38,10 @@
       },
       "master_timeout":{
         "type":"time",
-        "description":"Explicit operation timeout for connection to master node"
+        "description":"Timeout for waiting for new cluster state in case it is blocked"
       },
       "local":{
+        "deprecated":true,
         "type":"boolean",
         "description":"Return local information, do not retrieve the state from master node (default: false)"
       },

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/indices.get_index_template/10_basic.yml

@@ -82,14 +82,48 @@ setup:
 
 ---
 "Get index template with local flag":
+  - requires:
+      test_runner_features: ["allowed_warnings"]
 
   - do:
       indices.get_index_template:
         name: test
         local: true
+      allowed_warnings:
+        - "the [?local] query parameter to this API has no effect, is now deprecated, and will be removed in a future version"
 
   - match: {index_templates.0.name: test}
 
+---
+"Deprecated local parameter":
+  - requires:
+      capabilities:
+        - method: GET
+          path: /_get_index_template
+          capabilities: ["local_param_deprecated"]
+      test_runner_features: ["capabilities", "warnings"]
+      reason: Deprecation was implemented with capability
+
+  - do:
+      indices.get_index_template:
+        local: true
+      warnings:
+        - "the [?local] query parameter to this API has no effect, is now deprecated, and will be removed in a future version"
+
+---
+"Deprecated local parameter works in v8 compat mode":
+  - requires:
+      test_runner_features: ["headers"]
+
+  - do:
+      headers:
+        Content-Type: "application/vnd.elasticsearch+json;compatible-with=8"
+        Accept: "application/vnd.elasticsearch+json;compatible-with=8"
+      indices.get_index_template:
+        local: true
+
+  - exists: index_templates
+
 ---
 "Add data stream lifecycle":
   - requires:

server/src/internalClusterTest/java/org/elasticsearch/reservedstate/service/ComponentTemplatesFileSettingsIT.java

@@ -456,7 +456,7 @@ private void assertComponentAndIndexTemplateDelete(CountDownLatch savedClusterSt
 
         final var response = client().execute(
             GetComposableIndexTemplateAction.INSTANCE,
-            new GetComposableIndexTemplateAction.Request("template*")
+            new GetComposableIndexTemplateAction.Request(TEST_REQUEST_TIMEOUT, "template*")
         ).get();
 
         assertThat(response.indexTemplates().keySet().stream().collect(Collectors.toSet()), containsInAnyOrder("template_1", "template_2"));
@@ -594,7 +594,7 @@ private void assertClusterStateNotSaved(CountDownLatch savedClusterState, Atomic
 
         final var response = client().execute(
             GetComposableIndexTemplateAction.INSTANCE,
-            new GetComposableIndexTemplateAction.Request("err*")
+            new GetComposableIndexTemplateAction.Request(TEST_REQUEST_TIMEOUT, "err*")
         ).get();
 
         assertTrue(response.indexTemplates().isEmpty());

server/src/main/java/org/elasticsearch/action/admin/indices/template/get/GetComposableIndexTemplateAction.java

@@ -14,12 +14,17 @@
 import org.elasticsearch.action.ActionResponse;
 import org.elasticsearch.action.ActionType;
 import org.elasticsearch.action.admin.indices.rollover.RolloverConfiguration;
-import org.elasticsearch.action.support.master.MasterNodeReadRequest;
+import org.elasticsearch.action.support.local.LocalClusterStateRequest;
 import org.elasticsearch.cluster.metadata.ComposableIndexTemplate;
 import org.elasticsearch.cluster.metadata.DataStreamGlobalRetention;
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.core.Nullable;
+import org.elasticsearch.core.TimeValue;
+import org.elasticsearch.core.UpdateForV10;
+import org.elasticsearch.tasks.CancellableTask;
+import org.elasticsearch.tasks.Task;
+import org.elasticsearch.tasks.TaskId;
 import org.elasticsearch.xcontent.ParseField;
 import org.elasticsearch.xcontent.ToXContentObject;
 import org.elasticsearch.xcontent.XContentBuilder;
@@ -40,24 +45,30 @@ private GetComposableIndexTemplateAction() {
     /**
      * Request that to retrieve one or more index templates
      */
-    public static class Request extends MasterNodeReadRequest<Request> {
+    public static class Request extends LocalClusterStateRequest {
 
         @Nullable
         private final String name;
         private boolean includeDefaults;
 
         /**
+         * @param masterTimeout Timeout for waiting for new cluster state in case it is blocked.
          * @param name A template name or pattern, or {@code null} to retrieve all templates.
          */
-        public Request(@Nullable String name) {
-            super(TRAPPY_IMPLICIT_DEFAULT_MASTER_NODE_TIMEOUT);
+        public Request(TimeValue masterTimeout, @Nullable String name) {
+            super(masterTimeout);
             if (name != null && name.contains(",")) {
                 throw new IllegalArgumentException("template name may not contain ','");
             }
             this.name = name;
             this.includeDefaults = false;
         }
 
+        /**
+         * NB prior to 9.0 this was a TransportMasterNodeReadAction so for BwC we must remain able to read these requests until
+         * we no longer need to support calling this action remotely.
+         */
+        @UpdateForV10(owner = UpdateForV10.Owner.DATA_MANAGEMENT)
         public Request(StreamInput in) throws IOException {
             super(in);
             name = in.readOptionalString();
@@ -68,15 +79,6 @@ public Request(StreamInput in) throws IOException {
             }
         }
 
-        @Override
-        public void writeTo(StreamOutput out) throws IOException {
-            super.writeTo(out);
-            out.writeOptionalString(name);
-            if (out.getTransportVersion().onOrAfter(TransportVersions.V_8_9_X)) {
-                out.writeBoolean(includeDefaults);
-            }
-        }
-
         public void includeDefaults(boolean includeDefaults) {
             this.includeDefaults = includeDefaults;
         }
@@ -90,6 +92,11 @@ public ActionRequestValidationException validate() {
             return null;
         }
 
+        @Override
+        public Task createTask(long id, String type, String action, TaskId parentTaskId, Map<String, String> headers) {
+            return new CancellableTask(id, type, action, "", parentTaskId, headers);
+        }
+
         /**
          * The name of the index templates.
          */
@@ -124,19 +131,6 @@ public static class Response extends ActionResponse implements ToXContentObject
         @Nullable
         private final RolloverConfiguration rolloverConfiguration;
 
-        public Response(StreamInput in) throws IOException {
-            super(in);
-            indexTemplates = in.readMap(ComposableIndexTemplate::new);
-            if (in.getTransportVersion().onOrAfter(TransportVersions.V_8_9_X)) {
-                rolloverConfiguration = in.readOptionalWriteable(RolloverConfiguration::new);
-            } else {
-                rolloverConfiguration = null;
-            }
-            if (in.getTransportVersion().between(TransportVersions.V_8_14_0, TransportVersions.V_8_16_0)) {
-                in.readOptionalWriteable(DataStreamGlobalRetention::read);
-            }
-        }
-
         /**
          * Please use {@link GetComposableIndexTemplateAction.Response#Response(Map)}
          */
@@ -184,6 +178,11 @@ public RolloverConfiguration getRolloverConfiguration() {
             return rolloverConfiguration;
         }
 
+        /**
+         * NB prior to 9.0 this was a TransportMasterNodeReadAction so for BwC we must remain able to write these responses until
+         * we no longer need to support calling this action remotely.
+         */
+        @UpdateForV10(owner = UpdateForV10.Owner.DATA_MANAGEMENT)
         @Override
         public void writeTo(StreamOutput out) throws IOException {
             out.writeMap(indexTemplates, StreamOutput::writeWriteable);

server/src/main/java/org/elasticsearch/action/admin/indices/template/get/TransportGetComposableIndexTemplateAction.java

@@ -12,51 +12,61 @@
 import org.elasticsearch.ResourceNotFoundException;
 import org.elasticsearch.action.ActionListener;
 import org.elasticsearch.action.support.ActionFilters;
-import org.elasticsearch.action.support.master.TransportMasterNodeReadAction;
+import org.elasticsearch.action.support.ChannelActionListener;
+import org.elasticsearch.action.support.local.TransportLocalClusterStateAction;
 import org.elasticsearch.cluster.ClusterState;
 import org.elasticsearch.cluster.block.ClusterBlockException;
 import org.elasticsearch.cluster.block.ClusterBlockLevel;
 import org.elasticsearch.cluster.metadata.ComposableIndexTemplate;
 import org.elasticsearch.cluster.metadata.DataStreamLifecycle;
-import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
 import org.elasticsearch.cluster.service.ClusterService;
 import org.elasticsearch.common.regex.Regex;
 import org.elasticsearch.common.settings.ClusterSettings;
 import org.elasticsearch.common.util.concurrent.EsExecutors;
+import org.elasticsearch.core.UpdateForV10;
 import org.elasticsearch.injection.guice.Inject;
+import org.elasticsearch.tasks.CancellableTask;
 import org.elasticsearch.tasks.Task;
-import org.elasticsearch.threadpool.ThreadPool;
 import org.elasticsearch.transport.TransportService;
 
 import java.util.HashMap;
 import java.util.Map;
 
-public class TransportGetComposableIndexTemplateAction extends TransportMasterNodeReadAction<
+public class TransportGetComposableIndexTemplateAction extends TransportLocalClusterStateAction<
     GetComposableIndexTemplateAction.Request,
     GetComposableIndexTemplateAction.Response> {
 
     private final ClusterSettings clusterSettings;
 
+    /**
+     * NB prior to 9.0 this was a TransportMasterNodeReadAction so for BwC it must be registered with the TransportService until
+     * we no longer need to support calling this action remotely.
+     */
+    @UpdateForV10(owner = UpdateForV10.Owner.DATA_MANAGEMENT)
+    @SuppressWarnings("this-escape")
     @Inject
     public TransportGetComposableIndexTemplateAction(
         TransportService transportService,
         ClusterService clusterService,
-        ThreadPool threadPool,
-        ActionFilters actionFilters,
-        IndexNameExpressionResolver indexNameExpressionResolver
+        ActionFilters actionFilters
     ) {
         super(
             GetComposableIndexTemplateAction.NAME,
-            transportService,
-            clusterService,
-            threadPool,
             actionFilters,
-            GetComposableIndexTemplateAction.Request::new,
-            indexNameExpressionResolver,
-            GetComposableIndexTemplateAction.Response::new,
+            transportService.getTaskManager(),
+            clusterService,
             EsExecutors.DIRECT_EXECUTOR_SERVICE
         );
         clusterSettings = clusterService.getClusterSettings();
+
+        transportService.registerRequestHandler(
+            actionName,
+            executor,
+            false,
+            true,
+            GetComposableIndexTemplateAction.Request::new,
+            (request, channel, task) -> executeDirect(task, request, new ChannelActionListener<>(channel))
+        );
     }
 
     @Override
@@ -65,12 +75,13 @@ protected ClusterBlockException checkBlock(GetComposableIndexTemplateAction.Requ
     }
 
     @Override
-    protected void masterOperation(
+    protected void localClusterStateOperation(
         Task task,
         GetComposableIndexTemplateAction.Request request,
         ClusterState state,
         ActionListener<GetComposableIndexTemplateAction.Response> listener
     ) {
+        final var cancellableTask = (CancellableTask) task;
         Map<String, ComposableIndexTemplate> allTemplates = state.metadata().templatesV2();
         Map<String, ComposableIndexTemplate> results;
         // If we did not ask for a specific name, then we return all templates
@@ -91,6 +102,7 @@ protected void masterOperation(
                 throw new ResourceNotFoundException("index template matching [" + request.name() + "] not found");
             }
         }
+        cancellableTask.ensureNotCancelled();
         if (request.includeDefaults()) {
             listener.onResponse(
                 new GetComposableIndexTemplateAction.Response(

server/src/main/java/org/elasticsearch/rest/action/admin/indices/RestGetComposableIndexTemplateAction.java

@@ -14,8 +14,10 @@
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.rest.BaseRestHandler;
 import org.elasticsearch.rest.RestRequest;
+import org.elasticsearch.rest.RestUtils;
 import org.elasticsearch.rest.Scope;
 import org.elasticsearch.rest.ServerlessScope;
+import org.elasticsearch.rest.action.RestCancellableNodeClient;
 import org.elasticsearch.rest.action.RestToXContentListener;
 
 import java.io.IOException;
@@ -26,7 +28,6 @@
 import static org.elasticsearch.rest.RestRequest.Method.HEAD;
 import static org.elasticsearch.rest.RestStatus.NOT_FOUND;
 import static org.elasticsearch.rest.RestStatus.OK;
-import static org.elasticsearch.rest.RestUtils.getMasterNodeTimeout;
 
 @ServerlessScope(Scope.PUBLIC)
 public class RestGetComposableIndexTemplateAction extends BaseRestHandler {
@@ -47,17 +48,23 @@ public String getName() {
 
     @Override
     public RestChannelConsumer prepareRequest(final RestRequest request, final NodeClient client) throws IOException {
-        final GetComposableIndexTemplateAction.Request getRequest = new GetComposableIndexTemplateAction.Request(request.param("name"));
-
-        getRequest.local(request.paramAsBoolean("local", getRequest.local()));
-        getRequest.masterNodeTimeout(getMasterNodeTimeout(request));
+        final GetComposableIndexTemplateAction.Request getRequest = new GetComposableIndexTemplateAction.Request(
+            RestUtils.getMasterNodeTimeout(request),
+            request.param("name")
+        );
         getRequest.includeDefaults(request.paramAsBoolean("include_defaults", false));
+        RestUtils.consumeDeprecatedLocalParameter(request);
+
         final boolean implicitAll = getRequest.name() == null;
 
-        return channel -> client.execute(GetComposableIndexTemplateAction.INSTANCE, getRequest, new RestToXContentListener<>(channel, r -> {
-            final boolean templateExists = r.indexTemplates().isEmpty() == false;
-            return (templateExists || implicitAll) ? OK : NOT_FOUND;
-        }));
+        return channel -> new RestCancellableNodeClient(client, request.getHttpChannel()).execute(
+            GetComposableIndexTemplateAction.INSTANCE,
+            getRequest,
+            new RestToXContentListener<>(channel, r -> {
+                final boolean templateExists = r.indexTemplates().isEmpty() == false;
+                return (templateExists || implicitAll) ? OK : NOT_FOUND;
+            })
+        );
     }
 
     @Override