Run TransportGetIndexAction on local node

This action solely needs the cluster state, it can run on any node.
Since this is the last class/action that extends the `ClusterInfo`
abstract classes, we remove those classes too as they're not required
anymore.

Relates #101805

Author: nielsbauman

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

@@ -15,6 +15,7 @@
 import org.elasticsearch.action.admin.cluster.settings.ClusterGetSettingsAction;
 import org.elasticsearch.action.admin.cluster.state.ClusterStateAction;
 import org.elasticsearch.action.admin.indices.alias.get.GetAliasesAction;
+import org.elasticsearch.action.admin.indices.get.GetIndexAction;
 import org.elasticsearch.action.admin.indices.mapping.get.GetMappingsAction;
 import org.elasticsearch.action.admin.indices.recovery.RecoveryAction;
 import org.elasticsearch.action.admin.indices.template.get.GetComponentTemplateAction;
@@ -114,6 +115,11 @@ public void testGetMappingsCancellation() {
         runRestActionCancellationTest(new Request(HttpGet.METHOD_NAME, "/test/_mappings"), GetMappingsAction.NAME);
     }
 
+    public void testGetIndicesCancellation() {
+        createIndex("test");
+        runRestActionCancellationTest(new Request(HttpGet.METHOD_NAME, "/test"), GetIndexAction.NAME);
+    }
+
     private void runRestActionCancellationTest(Request request, String actionName) {
         final var node = usually() ? internalCluster().getRandomNodeName() : internalCluster().startCoordinatingOnlyNode(Settings.EMPTY);
 

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

@@ -17,9 +17,14 @@
   - is_true: ''
 ---
 "Test indices.exists with local flag":
+  - requires:
+      test_runner_features: ["allowed_warnings"]
+
   - do:
       indices.exists:
         index: test_index
         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"
 
   - is_false: ''

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

@@ -144,7 +144,6 @@
     exports org.elasticsearch.action.support.broadcast.node;
     exports org.elasticsearch.action.support.broadcast.unpromotable;
     exports org.elasticsearch.action.support.master;
-    exports org.elasticsearch.action.support.master.info;
     exports org.elasticsearch.action.support.nodes;
     exports org.elasticsearch.action.support.local;
     exports org.elasticsearch.action.support.replication;

server/src/main/java/module-info.java

@@ -9,13 +9,16 @@
 
 package org.elasticsearch.action.admin.indices.get;
 
+import org.elasticsearch.TransportVersions;
 import org.elasticsearch.action.ActionRequestValidationException;
+import org.elasticsearch.action.IndicesRequest;
 import org.elasticsearch.action.support.IndicesOptions;
-import org.elasticsearch.action.support.master.info.ClusterInfoRequest;
+import org.elasticsearch.action.support.local.LocalClusterStateRequest;
+import org.elasticsearch.common.Strings;
 import org.elasticsearch.common.io.stream.StreamInput;
-import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.util.ArrayUtils;
 import org.elasticsearch.core.TimeValue;
+import org.elasticsearch.core.UpdateForV10;
 import org.elasticsearch.rest.RestRequest;
 import org.elasticsearch.tasks.CancellableTask;
 import org.elasticsearch.tasks.Task;
@@ -32,7 +35,7 @@
 /**
  * A request to retrieve information about an index.
  */
-public class GetIndexRequest extends ClusterInfoRequest<GetIndexRequest> {
+public class GetIndexRequest extends LocalClusterStateRequest implements IndicesRequest.Replaceable {
     public enum Feature {
         ALIASES((byte) 0),
         MAPPINGS((byte) 1),
@@ -90,16 +93,30 @@ public static Feature[] fromRequest(RestRequest request) {
     }
 
     static final Feature[] DEFAULT_FEATURES = new Feature[] { Feature.ALIASES, Feature.MAPPINGS, Feature.SETTINGS };
+
+    private String[] indices = Strings.EMPTY_ARRAY;
+    private IndicesOptions indicesOptions;
     private Feature[] features = DEFAULT_FEATURES;
     private boolean humanReadable = false;
     private transient boolean includeDefaults = false;
 
     public GetIndexRequest(TimeValue masterTimeout) {
-        super(masterTimeout, IndicesOptions.strictExpandOpen());
+        super(masterTimeout);
+        indicesOptions = IndicesOptions.strictExpandOpen();
     }
 
+    /**
+     * NB prior to 9.1 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 GetIndexRequest(StreamInput in) throws IOException {
         super(in);
+        indices = in.readStringArray();
+        if (in.getTransportVersion().before(TransportVersions.V_8_0_0)) {
+            in.readStringArray();
+        }
+        indicesOptions = IndicesOptions.readIndicesOptions(in);
         features = in.readArray(i -> Feature.fromId(i.readByte()), Feature[]::new);
         humanReadable = in.readBoolean();
         includeDefaults = in.readBoolean();
@@ -162,11 +179,29 @@ public boolean includeDefaults() {
     }
 
     @Override
-    public void writeTo(StreamOutput out) throws IOException {
-        super.writeTo(out);
-        out.writeArray((o, f) -> o.writeByte(f.id), features);
-        out.writeBoolean(humanReadable);
-        out.writeBoolean(includeDefaults);
+    public GetIndexRequest indices(String... indices) {
+        this.indices = indices;
+        return this;
+    }
+
+    public GetIndexRequest indicesOptions(IndicesOptions indicesOptions) {
+        this.indicesOptions = indicesOptions;
+        return this;
+    }
+
+    @Override
+    public String[] indices() {
+        return indices;
+    }
+
+    @Override
+    public IndicesOptions indicesOptions() {
+        return indicesOptions;
+    }
+
+    @Override
+    public boolean includeDataStreams() {
+        return true;
     }
 
     @Override

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

@@ -9,17 +9,34 @@
 
 package org.elasticsearch.action.admin.indices.get;
 
+import org.elasticsearch.action.ActionRequestBuilder;
 import org.elasticsearch.action.admin.indices.get.GetIndexRequest.Feature;
-import org.elasticsearch.action.support.master.info.ClusterInfoRequestBuilder;
+import org.elasticsearch.action.support.IndicesOptions;
 import org.elasticsearch.client.internal.ElasticsearchClient;
+import org.elasticsearch.common.util.ArrayUtils;
 import org.elasticsearch.core.TimeValue;
 
-public class GetIndexRequestBuilder extends ClusterInfoRequestBuilder<GetIndexRequest, GetIndexResponse, GetIndexRequestBuilder> {
+public class GetIndexRequestBuilder extends ActionRequestBuilder<GetIndexRequest, GetIndexResponse> {
 
     public GetIndexRequestBuilder(ElasticsearchClient client, TimeValue masterTimeout, String... indices) {
         super(client, GetIndexAction.INSTANCE, new GetIndexRequest(masterTimeout).indices(indices));
     }
 
+    public GetIndexRequestBuilder setIndices(String... indices) {
+        request.indices(indices);
+        return this;
+    }
+
+    public GetIndexRequestBuilder addIndices(String... indices) {
+        request.indices(ArrayUtils.concat(request.indices(), indices));
+        return this;
+    }
+
+    public GetIndexRequestBuilder setIndicesOptions(IndicesOptions indicesOptions) {
+        request.indicesOptions(indicesOptions);
+        return this;
+    }
+
     public GetIndexRequestBuilder setFeatures(Feature... features) {
         request.features(features);
         return this;

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

@@ -19,6 +19,7 @@
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.xcontent.ChunkedToXContentObject;
+import org.elasticsearch.core.UpdateForV10;
 import org.elasticsearch.index.mapper.MapperService;
 import org.elasticsearch.xcontent.ToXContent;
 
@@ -69,6 +70,11 @@ public GetIndexResponse(
         }
     }
 
+    /**
+     * The only usage of this constructor is for BwC cross-cluster transforms for clusters before v8.2. The ML team is aware that we
+     * don't need to support that anymore now that we're on v9. Once they remove that BwC code, we can remove this constructor as well.
+     */
+    @UpdateForV10(owner = UpdateForV10.Owner.DATA_MANAGEMENT)
     GetIndexResponse(StreamInput in) throws IOException {
         this.indices = in.readStringArray();
         mappings = in.readImmutableOpenMap(StreamInput::readString, in.getTransportVersion().before(TransportVersions.V_8_0_0) ? i -> {
@@ -165,6 +171,11 @@ public String getSetting(String index, String setting) {
         }
     }
 
+    /**
+     * NB prior to 9.1 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.writeStringArray(indices);