Paperless NGX + Tika + Gotenberg

Hi all. I installed Paperless NGX on the most current release of Truesnas Scale from the Truenas Charts. So far so good. Installation went well and Paperless is working fine except of the integration of the Tika and Gutenberg. Unfortunately I can’t find any documentation on how to integrate these two. I set the attributes for these in Paperless configuration during the installation and can see in the logs that Paperless tries to access the services but is failing with the error 111 connection refused.
.eml: Could not parse content with tika server at http:// :9998: [Errno 111] Connection refused
Does anyone have an idea how to get rid of this? Every help is much appreciated!