Shellcheck comments (#9595)

java/cleanup.sh

@@ -1,6 +1,9 @@
+#!/usr/bin/env bash
+
 # Stop backend processes
 ray stop
 # Kill Java workers
+# shellcheck disable=SC2009
 ps aux | grep DefaultWorker | grep -v grep | awk '{print $2}' | xargs kill -9
 # Remove temp files
 rm -rf /tmp/ray