project.getPlugins().apply(InternalTestArtifactBasePlugin.class);
        InternalTestArtifactExtension testArtifactExtension = project.getExtensions().getByType(InternalTestArtifactExtension.class);
        SourceSet testSourceSet = project.getExtensions().getByType(SourceSetContainer.class).getByName("test");
        testArtifactExtension.registerTestArtifactFromSourceSet(testSourceSet);
    }

     */
    public void addExtension(CoreExtension coreExtension) {
        getExtensions().add(coreExtension);
    } // -- void addExtension( CoreExtension )

    /**
     * Method getExtensions.
     *
     * @return List
     */
    public List<CoreExtension> getExtensions() {
        if (this.extensions == null) {
            this.extensions = new ArrayList<CoreExtension>();
        }

                    (name, port) -> task.getExtensions().getByType(ExtraPropertiesExtension.class).set(name, port)
                );
            });

            maybeSkipTask(dockerSupport, preProcessFixture);
            maybeSkipTask(dockerSupport, postProcessFixture);
            maybeSkipTask(dockerSupport, buildFixture);

            ComposeExtension composeExtension = project.getExtensions().getByType(ComposeExtension.class);

        project.getTasks().register("buildResources", ExportElasticsearchBuildResourcesTask.class);

        // only setup tests to build
        SourceSetContainer sourceSets = project.getExtensions().getByType(SourceSetContainer.class);
        final SourceSet testSourceSet = sourceSets.create("test");

        project.getTasks().withType(Test.class).configureEach(test -> {

            @SuppressWarnings("unchecked")
            NamedDomainObjectContainer<ElasticsearchCluster> testClusters = (NamedDomainObjectContainer<ElasticsearchCluster>) project
                .getExtensions()
                .getByName(TestClustersPlugin.EXTENSION_NAME);
            ElasticsearchCluster cluster = testClusters.maybeCreate(restIntegTestTask.getName());
            restIntegTestTask.useCluster(cluster);

     }

    /**
     * Adds compiler settings to the project
     */
    public static void configureCompile(Project project) {
        project.getExtensions().getExtraProperties().set("compactProfile", "full");

        JavaPluginExtension java = project.getExtensions().getByType(JavaPluginExtension.class);
        java.setSourceCompatibility(BuildParams.getMinimumRuntimeVersion());

        configurePomGeneration(project);
        configurePublications(project);
    }

    private void configurePublications(Project project) {
        var publishingExtension = project.getExtensions().getByType(PublishingExtension.class);
        var publication = publishingExtension.getPublications().create("elastic", MavenPublication.class);
        project.afterEvaluate(project1 -> {

     * @return An Optional that contains the Java test SourceSet if it exists.
     */
    public static Optional<SourceSet> getJavaTestSourceSet(Project project) {
        return project.getExtensions().findByName("java") == null
            ? Optional.empty()
            : Optional.ofNullable(getJavaSourceSets(project).findByName(SourceSet.TEST_SOURCE_SET_NAME));
    }

    /**

                        "Elastic License 2.0", projectLicenseURL.get())
                )
        );
        // Default to the SSPL+Elastic dual license
        project.getExtensions().getExtraProperties().set("licenseCommit", licenseCommitProvider);
        project.getExtensions().getExtraProperties().set("projectLicenses", convention);
    }

    private boolean isSnapshotVersion(Project project) {

    }

    public void registerTestArtifactFromSourceSet(SourceSet sourceSet) {
        String name = sourceSet.getName();
        JavaPluginExtension javaPluginExtension = project.getExtensions().getByType(JavaPluginExtension.class);
        javaPluginExtension.registerFeature(name + "Artifacts", featureSpec -> {
            featureSpec.usingSourceSet(sourceSet);