Kibana v5.6.15 docker image build hung at 'stop:optimizeBuild' task

Hi,

Kibana v5.6.15 is hung while running 'stop:optimizeBuild' task.

Hi there, unfortunately 5.6 has passed its end of life date and we no longer offer support for it. Please upgrade to 6.3 or later to get support in the forums.

Thanks,
CJ