Polish "Avoid eager creation of aggregatedJavadoc task"

See gh-45223

spring-boot-project/spring-boot-docs/build.gradle

@@ -201,19 +201,7 @@ dokkatoo {
 	moduleName.set("Spring Boot Kotlin API")
 }
 
-tasks.register('aggregatedJavadoc', Javadoc)
-project.rootProject.gradle.projectsEvaluated {
-	Set<Project> publishedProjects = rootProject.subprojects.findAll { it != project }
-		.findAll { it.plugins.hasPlugin(JavaPlugin) && it.plugins.hasPlugin(MavenPublishPlugin) }
-		.findAll { !it.path.contains(":spring-boot-tools:") ||
-					it.path.contains(":spring-boot-tools:spring-boot-buildpack-platform") ||
-					it.path.contains(":spring-boot-tools:spring-boot-loader-tools") ||
-					(it.path.contains(":spring-boot-tools:spring-boot-loader") && !it.path.contains("spring-boot-loader-classic"))}
-		.findAll { !it.name.startsWith('spring-boot-starter') }
-	tasks.named('aggregatedJavadoc', Javadoc).configure {
-		dependsOn publishedProjects.javadoc
-		source publishedProjects.javadoc.source
-		classpath = project.files(publishedProjects.javadoc.classpath)
+def aggregatedJavadoc = tasks.register('aggregatedJavadoc', Javadoc) {
 	destinationDir = project.file(project.layout.buildDirectory.dir("docs/javadoc"))
 	options {
 		author = true
@@ -226,6 +214,20 @@ project.rootProject.gradle.projectsEvaluated {
 	}
 	doFirst(new ConfigureJavadocLinks(configurations.resolvedBom, ["Spring Framework", "Spring Security", "Tomcat"]))
 }
+
+project.rootProject.gradle.projectsEvaluated {
+	Set<Project> publishedProjects = rootProject.subprojects.findAll { it != project }
+		.findAll { it.plugins.hasPlugin(JavaPlugin) && it.plugins.hasPlugin(MavenPublishPlugin) }
+		.findAll { !it.path.contains(":spring-boot-tools:") ||
+					it.path.contains(":spring-boot-tools:spring-boot-buildpack-platform") ||
+					it.path.contains(":spring-boot-tools:spring-boot-loader-tools") ||
+					(it.path.contains(":spring-boot-tools:spring-boot-loader") && !it.path.contains("spring-boot-loader-classic"))}
+		.findAll { !it.name.startsWith('spring-boot-starter') }
+	aggregatedJavadoc.configure {
+		dependsOn publishedProjects.javadoc
+		source publishedProjects.javadoc.source
+		classpath = project.files(publishedProjects.javadoc.classpath)
+	}
 }
 
 tasks.register("documentTestSlices", org.springframework.boot.build.test.autoconfigure.DocumentTestSlices) {