Fail to delete connector for Postgresql

Hello

I try to remove a postgresql connector but I did not achieve to do it properly.

I create a connector, that works fine... Then I delete it...
curl -X DELETE http://localhost:8083/connectors/vertica

I got following logs :

[2019-01-24 15:08:11,944] INFO 127.0.0.1 - - [24/Jan/2019:14:08:11 +0000] "DELETE /connectors/vertical HTTP/1.1" 204 - 526 (org.apache.kafka.connect.runtime.rest.RestServer:60)
[2019-01-24 15:08:11,948] INFO Stopping connector vertical (org.apache.kafka.connect.runtime.Worker:301)
[2019-01-24 15:08:11,949] INFO Stopped connector vertical (org.apache.kafka.connect.runtime.Worker:317)
[2019-01-24 15:08:11,972] INFO Stopping task vertical-0 (org.apache.kafka.connect.runtime.Worker:447)

But after this operation, kconnect has a strange behavior, I can not get information about connectors and "curl -i -X GET -H "Accept:application/json" localhost:8083/connectors"
hangs...

The only command that does not hangs is :

curl -i -X GET -H "Accept:application/json" localhost:8083/connectors/vertical/status
HTTP/1.1 200 OK
Date: Thu, 24 Jan 2019 14:19:13 GMT
Content-Type: application/json
Content-Length: 159
Server: Jetty(9.2.15.v20160210)

{"name":"vertical","connector":

,"tasks":[

]}

The only solution I found is to restart kconnect, to make it works again...

Any idea if I did something wrong ? (I also try to apply a pause before deleting the connector with same result)