MirrorTemplatePlugin shouldn't log full stacktraces by default

In case of invalid UUID MirrorTemplatePlugin prints full stacktrace (see below) which is unnecessary polluting log files and in most cases just "confuses" users (e.g. unless it is some authorization exception, in most cases it is just wrong uuid).

Suggestion for improvement is to print uuid value and exception message and full stacktrace only in info/debug mode.

  log.error("Invalid docbase: '{}'", docbaseUuid, e);