Looks like some odd race condition causes failed builds by attempting to run the task that should be disabled. Disable the task explicitly untill we figure it out.
@@ -1,2 +1,5 @@
apply plugin: 'elasticsearch.build'
apply plugin: 'elasticsearch.test.fixtures'
+
+// TODO: elasticsearch.test.fixtures should disable this but it sometimes doesn't
+jarHell.enabled = false