This is just a note on a topic I saw on zope-list and that may be relevant to
the Silva catalog:
Moving a site from 2.7 to 2.9, so I need to run manage_covertIndexes.
The only problem is that, on the main catalog, this sends the machine into swap
I.e. memory use for manage_convertIndexes is very high. People work around it by
reindexing everything. Chris Withers claims to have a script that can do it