use resource root for manifest output too

Author: rjernst

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/transport/TransportVersionResourcesPlugin.java

@@ -61,8 +61,9 @@ public void apply(Project project) {
                 t.getDefinitionsDirectory().set(getDefinitionsDirectory(getResourcesDirectory(project)));
                 t.getManifestFile().set(project.getLayout().getBuildDirectory().file("generated-resources/manifest.txt"));
             });
+        String resourceRoot = TransportVersionUtils.getResourceRoot(project);
         project.getTasks().named(JavaPlugin.PROCESS_RESOURCES_TASK_NAME, Copy.class).configure(t -> {
-            t.into("transport/definitions", c -> c.from(generateManifestTask));
+            t.into(resourceRoot + "/definitions", c -> c.from(generateManifestTask));
         });
     }
 }

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/transport/TransportVersionUtils.java

@@ -50,11 +50,16 @@ static Directory getResourcesDirectory(Project project) {
         if (projectName == null) {
             projectName = ":server";
         }
+        var resourceRoot = getResourceRoot(project);
+        Directory projectDir = project.project(projectName.toString()).getLayout().getProjectDirectory();
+        return projectDir.dir("src/main/resources/" + resourceRoot);
+    }
+
+    static String getResourceRoot(Project project) {
         var resourceRoot = project.findProperty("org.elasticsearch.transport.resourceRoot");
         if (resourceRoot == null) {
             resourceRoot = "transport";
         }
-        Directory projectDir = project.project(projectName.toString()).getLayout().getProjectDirectory();
-        return projectDir.dir("src/main/resources/" + resourceRoot);
+        return resourceRoot.toString();
     }
 }