Conversations and search

[Sebastian Hagedorn]

Hi,

I have a question regarding the conversations db and how it affects 
(Xapian) search. In this GitHub issue 
(<https://github.com/cyrusimap/cyrus-imapd/issues/2376>) I was dealing with 
Xapian search always failing. The underlying reason turned out to be an 
empty conversations db. When I regenerate that user's conversations db, 
Xapian search works fine. So far, so good. But then I noticed this piece of 
documentation:

<https://www.cyrusimap.org/imap/concepts/deployment/databases.html?highlight=conversations#conversations-userid-conversations>

Quote: "This file contains all the message-id fields from every email that 
has been seen in the ***past three months***, mapping to the conversation 
IDs in which this message ID has been seen, and the timestamp when it was 
last seen."

This raises a number of questions. What does "has been seen" mean in this 
context? And does it mean that Xapian search will always fail to find 
emails that arrived more than three months ago?? That doesn't sound very 
useful ...
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