How can I remove field on Graylog 3.2

[stanley.chen]

As attached file, I am newborn on Graylog server.
I created a lot of test field on Input Extractors…
When I delete the all of Input Extractors , but field still not deleted.
Can someone give a sample to teach me to delete those test fields.
Thanks!!

[macko003]

Basic the delete not possible.
It list all fields what is in your log database. If it will be deleted by the retention settings, it will disappear.

[stanley.chen]

I have successfully removed unnecessary items.
Thanks for your great help…