end the stream-job in docker container will remain some zombie processes in 1.11, these useless processes not be maked as zombie but still exist in 1.12

when i use pyflink in docker , end the stream-job will remain some process. these process used for endpoint  and tmp python logs . In flink-1.11 ,these process will be marked as zombie; in flink-1.12, these process wont be marked but still exit 。