Currently elasticsearch in integ tests is started using an ant task on
windows, or gradle exec on everything else. However, gradle exec has
some flaws, one being Ctrl-C does not run finalizedBy tasks, which means
interrupting integ tests will leak a jvm. This change makes all systems
use ant exec. One caveat is, if there is any output by the jvm, we lose
it in ant bit heaven. But this is no different than what we had with
gradle. In the future, we should look at using a separate thread to
pump streams from the elasticsearch process.
closes#14701
9373382155