Fix java version of build-tools test

Author: alpar-t

gradle/runtime-jdk-provision.gradle

@@ -5,20 +5,23 @@ import org.elasticsearch.gradle.info.BuildParams
 apply plugin: 'elasticsearch.jdk-download'
 
 jdks {
-    provisioned_runtime {
-        vendor = VersionProperties.bundledJdkVendor
-        version = VersionProperties.getBundledJdk(OS.current().name().toLowerCase())
-        platform = OS.current().name().toLowerCase()
-    }
+  provisioned_runtime {
+    vendor = VersionProperties.bundledJdkVendor
+    version = VersionProperties.getBundledJdk(OS.current().name().toLowerCase())
+    platform = OS.current().name().toLowerCase()
+  }
 }
 
 allprojects {
+  if (project.path != ":build-tools") {
+    //  Build tools doesn't support java 8 still used in CI
     project.tasks.withType(Test).configureEach { Test test ->
-        if (BuildParams.getIsRuntimeJavaHomeSet()) {
-            test.executable = "${BuildParams.runtimeJavaHome}/bin/java"
-        } else {
-            test.dependsOn(rootProject.jdks.provisioned_runtime)
-            test.executable = rootProject.jdks.provisioned_runtime.getBinJavaPath()
-        }
+      if (BuildParams.getIsRuntimeJavaHomeSet()) {
+        test.executable = "${BuildParams.runtimeJavaHome}/bin/java"
+      } else {
+        test.dependsOn(rootProject.jdks.provisioned_runtime)
+        test.executable = rootProject.jdks.provisioned_runtime.getBinJavaPath()
+      }
     }
-}
+  }
+}