LUCENE-9179: don't invoke the same build recursively upon first run, just continue. Seems like gradle bug but let's not cry about it - it just happens once and CI defaults can be passed independently on command-line.

gradle/generate-defaults.gradle

@@ -4,28 +4,18 @@
 
 def hasDefaults = rootProject.file("gradle.properties").exists()
 
-// If we don't have the defaults yet, create them and re-run the build
-// recursively with the same parameters as originally passed.
-//
-// Sadly, the recursive build doesn't seem to pick up the parallelism
-// tweaks from gradle.properties file.
+// If we don't have the defaults yet, create them.
 
 if (!hasDefaults) {
   configure(rootProject) {
-    task setupLocalDefaultsOnce(type: GradleBuild) {
+    task localSettings() {
+      doFirst {
         // Approximate a common-sense default for running gradle/tests with parallel
         // workers: half the count of available cpus but not more than 12.
         def cpus = Runtime.runtime.availableProcessors()
         def maxWorkers = (int) Math.max(1d, Math.min(cpus * 0.5d, 12))
         def testsJvms = (int) Math.max(1d, Math.min(cpus * 0.5d, 12))
 
-      // Reuse the same set of parameters for the recursive invocation and apply
-      // some of these eagerly.
-      def startParams = gradle.startParameter.newInstance()
-      startParams.setParallelProjectExecutionEnabled(true)
-      startParams.setMaxWorkerCount(maxWorkers)
-      startParameter(startParams)
-
         // Write the defaults for this machine.
         rootProject.file("gradle.properties").write(
             [
@@ -45,7 +35,6 @@ if (!hasDefaults) {
                 "tests.jvms=${testsJvms}"
             ].join("\n"), "UTF-8")
 
-      doFirst {
         logger.log(LogLevel.WARN, "\nIMPORTANT. This is the first time you ran the build. " +
             "I wrote some sane defaults (for this machine) to 'gradle.properties', " +
             "they will be picked up on consecutive gradle invocations (not this one).\n\n" +
@@ -54,20 +43,11 @@ if (!hasDefaults) {
     }
   }
 
-  // Disable any tasks in this build, they were forked recursively.
-  gradle.taskGraph.whenReady { graph ->
-    graph.allTasks.each { task ->
-      if (task != rootProject.setupLocalDefaultsOnce) {
-        task.enabled = false
-      }
-    }
-  }
-
   // Make all tasks depend on local setup to make sure it'll run.
   allprojects {
     tasks.all { task ->
-      if (task != rootProject.setupLocalDefaultsOnce) {
-        task.dependsOn rootProject.setupLocalDefaultsOnce
+      if (task != rootProject.localSettings) {
+        task.dependsOn rootProject.localSettings
       }
     }
   }