An error occurs when executing a docker in version 2.7: ps not found

[pjy1368]

Hi. I follow the official guide document for installing the fscrawler using a docker, but the following error occurred.

/usr/bin/fscrawler: 47: /usr/bin/fscrawler: ps: not found
ERROR StatusLogger Reconfiguration failed: No configuration found for '55054057' at 'null' in 'null'

In addition, no work is performed and unlimited loading is performed.
My folder structure is as follows.

The folder '.fscrawler' is an empty folder, and an example document file exists in the folder 'tmp'.

[dadoonet]

It's a bug. See #1229