Add special find for root element

Signed-off-by: xcgspring <xcg1987xcg@126.com>
change default logging level to INFO

Signed-off-by: xcgspring <xcg1987xcg@126.com>
Revert "change default logging level to INFO"

This reverts commit 61b5b528faf269889a877c77a2ac058f0d6c00d0.
Change default logging level to INFO

Signed-off-by: xcgspring <xcg1987xcg@126.com>