disable annotation processor for docs (#30610)

* disable annotation processor for docs

Could not find evidence that the log4j annotation processor is used.
The compiler flag enables the Gradle 5.0 behavior

Closes #30476

* Disable annotation processors for all tests

* remove redundant `-proc:none` already handled by required plugins

* Revert unintentional changes

buildSrc/src/main/groovy/org/elasticsearch/gradle/test/StandaloneTestPlugin.groovy

@@ -24,6 +24,7 @@ import org.elasticsearch.gradle.BuildPlugin
 import org.gradle.api.Plugin
 import org.gradle.api.Project
 import org.gradle.api.plugins.JavaBasePlugin
+import org.gradle.api.tasks.compile.JavaCompile
 
 /**
  * Configures the build to compile against Elasticsearch's test framework and
@@ -49,5 +50,12 @@ public class StandaloneTestPlugin implements Plugin<Project> {
         test.testClassesDir project.sourceSets.test.output.classesDir
         test.mustRunAfter(project.precommit)
         project.check.dependsOn(test)
+
+        project.tasks.withType(JavaCompile) {
+            // This will be the default in Gradle 5.0
+            if (options.compilerArgs.contains("-processor") == false) {
+                options.compilerArgs << '-proc:none'
+            }
+        }
     }
 }