Edit the Dockerfile to include:
ENV PLUTEXT_PDF_CONFORMANCE=2B
then build:
docker build -t plutextdocumentservices .
The configuration file is at /opt/PlutextDocumentServices/PlutextDocumentServices.config
Add a line which sets PLUTEXT_PDF_CONFORMANCE
For example:
PLUTEXT_PDF_CONFORMANCE=2B
Then restart the plutextd daemon.
For PDF/A, you need registry setting PDF_CONFORMANCE=2B at Computer\HKEY_LOCAL_MACHINE\SOFTWARE\PLUTEXT (then restart the pds service)
After configuring 2B as above, convert a docx to PDF.
If you open the resulting PDF in Acrobat Reader, you should see: