SourceOne reindexing stuck

Hello

We have some issues with reindexing process stuck in sourceone console. We had a missing message error in few volumes so I decided to reindex them completely. All where fine but one, that one stuck and did nothing for days. after rebooting the whole server, it still says "reindexing, missing messages" for a whole week now, but cpu and disk usage is 0% for that process.

What can I do to change the status of that volume, somehow tell the S1 it's finished or canceled so I can start reindexing of that volume again?

It is S1 for Lotus Domino

Thank you in advance,

best regards