HLRC: Add Delete License API (#32586)

Relates to #29827

client/rest-high-level/src/main/java/org/elasticsearch/client/LicenseClient.java

@@ -29,6 +29,8 @@
 import org.elasticsearch.common.xcontent.XContentFactory;
 import org.elasticsearch.common.xcontent.XContentParser;
 import org.elasticsearch.common.xcontent.XContentType;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseRequest;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseResponse;
 import org.elasticsearch.protocol.xpack.license.GetLicenseRequest;
 import org.elasticsearch.protocol.xpack.license.GetLicenseResponse;
 import org.elasticsearch.protocol.xpack.license.PutLicenseRequest;
@@ -98,6 +100,27 @@ public void getLicenseAsync(GetLicenseRequest request, RequestOptions options, A
             response -> new GetLicenseResponse(convertResponseToJson(response)), listener, emptySet());
     }
 
+    /**
+     * Deletes license from the cluster.
+     * @param options the request options (e.g. headers), use {@link RequestOptions#DEFAULT} if nothing needs to be customized
+     * @return the response
+     * @throws IOException in case there is a problem sending the request or parsing back the response
+     */
+    public DeleteLicenseResponse deleteLicense(DeleteLicenseRequest request, RequestOptions options) throws IOException {
+        return restHighLevelClient.performRequestAndParseEntity(request, RequestConverters::deleteLicense, options,
+            DeleteLicenseResponse::fromXContent, emptySet());
+    }
+
+    /**
+     * Asynchronously deletes license from the cluster.
+     * @param options the request options (e.g. headers), use {@link RequestOptions#DEFAULT} if nothing needs to be customized
+     * @param listener the listener to be notified upon request completion
+     */
+    public void deleteLicenseAsync(DeleteLicenseRequest request, RequestOptions options, ActionListener<DeleteLicenseResponse> listener) {
+        restHighLevelClient.performRequestAsyncAndParseEntity(request, RequestConverters::deleteLicense, options,
+            DeleteLicenseResponse::fromXContent, listener, emptySet());
+    }
+
     /**
      * Converts an entire response into a json string
      *

client/rest-high-level/src/main/java/org/elasticsearch/client/RequestConverters.java

@@ -108,6 +108,7 @@
 import org.elasticsearch.index.rankeval.RankEvalRequest;
 import org.elasticsearch.protocol.xpack.XPackInfoRequest;
 import org.elasticsearch.protocol.xpack.XPackUsageRequest;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseRequest;
 import org.elasticsearch.protocol.xpack.license.GetLicenseRequest;
 import org.elasticsearch.protocol.xpack.license.PutLicenseRequest;
 import org.elasticsearch.protocol.xpack.migration.IndexUpgradeInfoRequest;
@@ -1178,7 +1179,6 @@ static Request putLicense(PutLicenseRequest putLicenseRequest) {
         return request;
     }
 
-
     static Request getLicense(GetLicenseRequest getLicenseRequest) {
         String endpoint = new EndpointBuilder()
             .addPathPartAsIs("_xpack")
@@ -1190,6 +1190,14 @@ static Request getLicense(GetLicenseRequest getLicenseRequest) {
         return request;
     }
 
+    static Request deleteLicense(DeleteLicenseRequest deleteLicenseRequest) {
+        Request request = new Request(HttpDelete.METHOD_NAME, "/_xpack/license");
+        Params parameters = new Params(request);
+        parameters.withTimeout(deleteLicenseRequest.timeout());
+        parameters.withMasterTimeout(deleteLicenseRequest.masterNodeTimeout());
+        return request;
+    }
+
     static Request putMachineLearningJob(PutJobRequest putJobRequest) throws IOException {
         String endpoint = new EndpointBuilder()
             .addPathPartAsIs("_xpack")

client/rest-high-level/src/test/java/org/elasticsearch/client/documentation/LicensingDocumentationIT.java

@@ -25,6 +25,9 @@
 import org.elasticsearch.client.ESRestHighLevelClientTestCase;
 import org.elasticsearch.client.RequestOptions;
 import org.elasticsearch.client.RestHighLevelClient;
+import org.elasticsearch.common.Booleans;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseRequest;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseResponse;
 import org.elasticsearch.protocol.xpack.license.GetLicenseRequest;
 import org.elasticsearch.protocol.xpack.license.GetLicenseResponse;
 import org.elasticsearch.protocol.xpack.license.LicensesStatus;
@@ -47,7 +50,7 @@
  */
 public class LicensingDocumentationIT extends ESRestHighLevelClientTestCase {
 
-    public void testPutLicense() throws Exception {
+    public void testLicense() throws Exception {
         assumeTrue("License is only valid when tested against snapshot/test builds", Build.CURRENT.isSnapshot());
         RestHighLevelClient client = highLevelClient();
         String license = "{\"license\": {\"uid\":\"893361dc-9749-4997-93cb-802e3d7fa4a8\",\"type\":\"gold\"," +
@@ -86,7 +89,7 @@ public void testPutLicense() throws Exception {
             // tag::put-license-execute-listener
             ActionListener<PutLicenseResponse> listener = new ActionListener<PutLicenseResponse>() {
                 @Override
-                public void onResponse(PutLicenseResponse indexResponse) {
+                public void onResponse(PutLicenseResponse putLicenseResponse) {
                     // <1>
                 }
 
@@ -108,6 +111,51 @@ public void onFailure(Exception e) {
 
             assertTrue(latch.await(30L, TimeUnit.SECONDS));
         }
+
+        // we cannot actually delete the license, otherwise the remaining tests won't work
+        if (Booleans.isTrue("true")) {
+            return;
+        }
+        {
+            //tag::delete-license-execute
+            DeleteLicenseRequest request = new DeleteLicenseRequest();
+
+            DeleteLicenseResponse response = client.license().deleteLicense(request, RequestOptions.DEFAULT);
+            //end::delete-license-execute
+
+            //tag::delete-license-response
+            boolean acknowledged = response.isAcknowledged(); // <1>
+            //end::delete-license-response
+
+            assertTrue(acknowledged);
+        }
+        {
+            DeleteLicenseRequest request = new DeleteLicenseRequest();
+            // tag::delete-license-execute-listener
+            ActionListener<DeleteLicenseResponse> listener = new ActionListener<DeleteLicenseResponse>() {
+                @Override
+                public void onResponse(DeleteLicenseResponse deleteLicenseResponse) {
+                    // <1>
+                }
+
+                @Override
+                public void onFailure(Exception e) {
+                    // <2>
+                }
+            };
+            // end::delete-license-execute-listener
+
+            // Replace the empty listener by a blocking listener in test
+            final CountDownLatch latch = new CountDownLatch(1);
+            listener = new LatchedActionListener<>(listener, latch);
+
+            // tag::delete-license-execute-async
+            client.license().deleteLicenseAsync(
+                request, RequestOptions.DEFAULT, listener); // <1>
+            // end::delete-license-execute-async
+
+            assertTrue(latch.await(30L, TimeUnit.SECONDS));
+        }
     }
 
     public void testGetLicense() throws Exception {

docs/java-rest/high-level/licensing/delete-license.asciidoc

@@ -0,0 +1,51 @@
+[[java-rest-high-delete-license]]
+=== Delete License
+
+[[java-rest-high-delete-license-execution]]
+==== Execution
+
+The license can be deleted using the `deleteLicense()` method:
+
+["source","java",subs="attributes,callouts,macros"]
+--------------------------------------------------
+include-tagged::{doc-tests}/LicensingDocumentationIT.java[delete-license-execute]
+--------------------------------------------------
+
+[[java-rest-high-delete-license-response]]
+==== Response
+
+The returned `DeleteLicenseResponse` contains the `acknowledged` flag, which
+returns true if the request was processed by all nodes.
+
+["source","java",subs="attributes,callouts,macros"]
+--------------------------------------------------
+include-tagged::{doc-tests}/LicensingDocumentationIT.java[delete-license-response]
+--------------------------------------------------
+<1> Check the acknowledge flag. It should be true if license deletion is acknowledged.
+
+[[java-rest-high-delete-license-async]]
+==== Asynchronous Execution
+
+This request can be executed asynchronously:
+
+["source","java",subs="attributes,callouts,macros"]
+--------------------------------------------------
+include-tagged::{doc-tests}/LicensingDocumentationIT.java[delete-license-execute-async]
+--------------------------------------------------
+<1> The `DeleteLicenseRequest` to execute and the `ActionListener` to use when
+the execution completes
+
+The asynchronous method does not block and returns immediately. Once it is
+completed the `ActionListener` is called back using the `onResponse` method
+if the execution successfully completed or using the `onFailure` method if
+it failed.
+
+A typical listener for `DeleteLicenseResponse` looks like:
+
+["source","java",subs="attributes,callouts,macros"]
+--------------------------------------------------
+include-tagged::{doc-tests}/LicensingDocumentationIT.java[delete-license-execute-listener]
+--------------------------------------------------
+<1> Called when the execution is successfully completed. The response is
+provided as an argument
+<2> Called in case of failure. The raised exception is provided as an argument

docs/java-rest/high-level/supported-apis.asciidoc

@@ -194,9 +194,11 @@ The Java High Level REST Client supports the following Licensing APIs:
 
 * <<java-rest-high-put-license>>
 * <<java-rest-high-get-license>>
+* <<java-rest-high-delete-license>>
 
 include::licensing/put-license.asciidoc[]
 include::licensing/get-license.asciidoc[]
+include::licensing/delete-license.asciidoc[]
 
 == Migration APIs
 

x-pack/plugin/core/src/main/java/org/elasticsearch/license/DeleteLicenseAction.java

@@ -6,6 +6,7 @@
 package org.elasticsearch.license;
 
 import org.elasticsearch.action.Action;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseResponse;
 
 public class DeleteLicenseAction extends Action<DeleteLicenseResponse> {
 

x-pack/plugin/core/src/main/java/org/elasticsearch/license/DeleteLicenseRequestBuilder.java

@@ -7,6 +7,8 @@
 
 import org.elasticsearch.action.support.master.AcknowledgedRequestBuilder;
 import org.elasticsearch.client.ElasticsearchClient;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseRequest;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseResponse;
 
 public class DeleteLicenseRequestBuilder extends AcknowledgedRequestBuilder<DeleteLicenseRequest, DeleteLicenseResponse,
         DeleteLicenseRequestBuilder> {

x-pack/plugin/core/src/main/java/org/elasticsearch/license/LicenseService.java

@@ -28,6 +28,7 @@
 import org.elasticsearch.env.Environment;
 import org.elasticsearch.gateway.GatewayService;
 import org.elasticsearch.protocol.xpack.XPackInfoResponse;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseRequest;
 import org.elasticsearch.protocol.xpack.license.LicensesStatus;
 import org.elasticsearch.protocol.xpack.license.PutLicenseResponse;
 import org.elasticsearch.watcher.ResourceWatcherService;

x-pack/plugin/core/src/main/java/org/elasticsearch/license/LicensingClient.java

@@ -7,6 +7,8 @@
 
 import org.elasticsearch.action.ActionListener;
 import org.elasticsearch.client.ElasticsearchClient;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseRequest;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseResponse;
 import org.elasticsearch.protocol.xpack.license.GetLicenseRequest;
 import org.elasticsearch.protocol.xpack.license.PutLicenseResponse;
 

x-pack/plugin/core/src/main/java/org/elasticsearch/license/RestDeleteLicenseAction.java

@@ -6,6 +6,7 @@
 package org.elasticsearch.license;
 
 import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseRequest;
 import org.elasticsearch.rest.RestController;
 import org.elasticsearch.rest.RestRequest;
 import org.elasticsearch.rest.action.RestToXContentListener;

x-pack/plugin/core/src/main/java/org/elasticsearch/license/TransportDeleteLicenseAction.java

@@ -17,6 +17,8 @@
 import org.elasticsearch.cluster.metadata.IndexNameExpressionResolver;
 import org.elasticsearch.common.inject.Inject;
 import org.elasticsearch.common.settings.Settings;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseRequest;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseResponse;
 import org.elasticsearch.threadpool.ThreadPool;
 import org.elasticsearch.transport.TransportService;
 

x-pack/plugin/core/src/test/java/org/elasticsearch/license/LicensesManagerServiceTests.java

@@ -11,6 +11,7 @@
 import org.elasticsearch.common.settings.Settings;
 import org.elasticsearch.common.unit.TimeValue;
 import org.elasticsearch.plugins.Plugin;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseRequest;
 import org.elasticsearch.protocol.xpack.license.LicensesStatus;
 import org.elasticsearch.test.ESSingleNodeTestCase;
 import org.elasticsearch.xpack.core.LocalStateCompositeXPackPlugin;

x-pack/plugin/core/src/test/java/org/elasticsearch/license/LicensesTransportTests.java

@@ -12,6 +12,7 @@
 import org.elasticsearch.common.xcontent.XContentType;
 import org.elasticsearch.node.Node;
 import org.elasticsearch.plugins.Plugin;
+import org.elasticsearch.protocol.xpack.license.DeleteLicenseResponse;
 import org.elasticsearch.protocol.xpack.license.LicensesStatus;
 import org.elasticsearch.protocol.xpack.license.PutLicenseResponse;
 import org.elasticsearch.test.ESSingleNodeTestCase;

x-pack/protocol/src/main/java/org/elasticsearch/protocol/xpack/license/DeleteLicenseRequest.java

@@ -0,0 +1,31 @@
+/*
+ * Licensed to Elasticsearch under one or more contributor
+ * license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright
+ * ownership. Elasticsearch licenses this file to you under
+ * the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+package org.elasticsearch.protocol.xpack.license;
+
+import org.elasticsearch.action.ActionRequestValidationException;
+import org.elasticsearch.action.support.master.AcknowledgedRequest;
+
+
+public class DeleteLicenseRequest extends AcknowledgedRequest<DeleteLicenseRequest> {
+
+    @Override
+    public ActionRequestValidationException validate() {
+        return null;
+    }
+}