[GPU] Switch to triple-license for the gpu plugin (elastic#137980) (elastic#138080)

The GPU plugins is in a tricky spot:
- it needs to have a OSI-approved Open Source license (AGPL)
- it has been decided to have it at the Enterprise subscription level

In this PR, we change the license for the GPU plugin to our triple-license, for source code headers, plugin bundle LICENSE.txt, and jar file META-INF/LICENSE.txt

Author: ldematte

build-conventions/src/main/java/org/elasticsearch/gradle/internal/conventions/LicensingPlugin.java

@@ -44,8 +44,9 @@ public void apply(Project project) {
         Provider<String> agplLicenseURL = licenseCommitProvider.map(
             licenseCommit -> ELASTIC_LICENSE_URL_PREFIX + licenseCommit + AGPL_ELASTIC_LICENSE_URL_POSTFIX
         );
-        // But stick the Elastic license url in project.ext so we can get it if we need to switch to it
+        // Stick the license urls in project.ext so we can get them if we need to switch to them
         project.getExtensions().getExtraProperties().set("elasticLicenseUrl", elasticLicenseURL);
+        project.getExtensions().getExtraProperties().set("agplLicenseUrl", agplLicenseURL);
 
         MapProperty<String, Provider<String>> licensesProperty = project.getObjects()
             .mapProperty(String.class, (Class<Provider<String>>) (Class<?>) Provider.class)

x-pack/plugin/gpu/build.gradle

@@ -1,8 +1,18 @@
-apply plugin: 'elasticsearch.internal-es-plugin'
+import org.elasticsearch.gradle.plugin.PluginBuildPlugin
+
 apply plugin: 'elasticsearch.internal-cluster-test'
 apply plugin: 'elasticsearch.internal-yaml-rest-test'
 apply plugin: 'elasticsearch.mrjar'
 
+// Override the license file to be included in the plugin bundle.
+// We need to do this now, before the BaseInternalPluginBuildPlugin is applied, because the plugin will
+// immediately try to read it from esplugin.licenseFile (PluginPropertiesExtension) before we get a chance to set it
+// a few lines below.
+plugins.withType(PluginBuildPlugin).whenPluginAdded {
+  project.esplugin.licenseFile = layout.settingsDirectory.file('licenses/AGPL-3.0+SSPL-1.0+ELASTIC-LICENSE-2.0.txt').asFile
+}
+apply plugin: 'elasticsearch.internal-es-plugin'
+
 esplugin {
   name = 'gpu'
   description = 'A plugin for doing vector search in GPU'
@@ -23,6 +33,24 @@ dependencies {
   clusterModules project(xpackModule('gpu'))
 }
 
+ext.projectLicenses.set(
+    [
+      'Server Side Public License, v 1': providers.provider(() -> 'https://www.mongodb.com/licensing/server-side-public-license'),
+      'Elastic License 2.0': ext.elasticLicenseUrl,
+      'GNU Affero General Public License Version 3': ext.agplLicenseUrl
+    ])
+
+// We need to override the JAR license file too (the one placed in META-INF)
+licenseFile.set(layout.settingsDirectory.file('licenses/AGPL-3.0+SSPL-1.0+ELASTIC-LICENSE-2.0.txt').asFile)
+
+// And we need to reset the license header checker. Notice that we need to set additionalLicense here to
+// match the initial default from LicenseHeadersTask#conventionalLicenses, as the x-pack parent gradle
+// resets additionalLicense to 'Elastic License 2.0'
+tasks.named("licenseHeaders").configure {
+  approvedLicenses = ['AGLP+SSPL+Elastic License', 'Generated', 'Vendored']
+  additionalLicense 'TRIPL', 'AGLP+SSPL+Elastic License', "2.0\", the \"GNU Affero General Public License v3.0 only\", and the \"Server Side"
+}
+
 artifacts {
   restXpackTests(new File(projectDir, "src/yamlRestTest/resources/rest-api-spec/test"))
 }

x-pack/plugin/gpu/src/internalClusterTest/java/org/elasticsearch/plugin/gpu/CuVSProviderDelegate.java

@@ -1,8 +1,10 @@
 /*
  * 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; you may not use this file except in compliance with the Elastic License
- * 2.0.
+ * 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.plugin.gpu;

x-pack/plugin/gpu/src/internalClusterTest/java/org/elasticsearch/plugin/gpu/GPUIndexIT.java

@@ -1,8 +1,10 @@
 /*
  * 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; you may not use this file except in compliance with the Elastic License
- * 2.0.
+ * 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.plugin.gpu;

x-pack/plugin/gpu/src/internalClusterTest/java/org/elasticsearch/plugin/gpu/GPUPluginInitializationUnsupportedIT.java

@@ -1,8 +1,10 @@
 /*
  * 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; you may not use this file except in compliance with the Elastic License
- * 2.0.
+ * 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.plugin.gpu;

x-pack/plugin/gpu/src/internalClusterTest/java/org/elasticsearch/plugin/gpu/GPUPluginInitializationWithGPUIT.java

@@ -1,8 +1,10 @@
 /*
  * 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; you may not use this file except in compliance with the Elastic License
- * 2.0.
+ * 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.plugin.gpu;

x-pack/plugin/gpu/src/internalClusterTest/java/org/elasticsearch/plugin/gpu/GPUPluginInitializationWithoutGPUIT.java

@@ -1,8 +1,10 @@
 /*
  * 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; you may not use this file except in compliance with the Elastic License
- * 2.0.
+ * 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.plugin.gpu;

x-pack/plugin/gpu/src/internalClusterTest/java/org/elasticsearch/plugin/gpu/TestCuVSServiceProvider.java

@@ -1,8 +1,10 @@
 /*
  * 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; you may not use this file except in compliance with the Elastic License
- * 2.0.
+ * 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.plugin.gpu;

x-pack/plugin/gpu/src/main/java/module-info.java

@@ -1,8 +1,10 @@
 /*
  * 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; you may not use this file except in compliance with the Elastic License
- * 2.0.
+ * 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".
  */
 
 import org.elasticsearch.xpack.gpu.codec.ES92GpuHnswSQVectorsFormat;

x-pack/plugin/gpu/src/main/java/org/elasticsearch/xpack/gpu/GPUFeatures.java

@@ -1,8 +1,10 @@
 /*
  * 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; you may not use this file except in compliance with the Elastic License
- * 2.0.
+ * 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.xpack.gpu;