Sorry for all the threads I've been creating lately, I appreciate your help 
and the work you've put into TS! :)

Given that indexing is suddenly taking so long and so much space, naturally 
I have begun exploring delta index issues, and have a few questions. The 
documentation page does not seem to be updated for TS3 (is there another 
doc page somewhere I can look at), so I hope you wouldn't mind answering 
the following:


   1. Delta indexing seems to be triggered by saving a record, inline with 
   the process, is that correct?
   2. If so, is there an option to run delta indexing outside of the 
   request process? Is that what the DJ delta gem is for, and is that set up 
   for TS3?
   3. What determines what triggers the delta to reindex? If associated 
   records are updated does that trigger it? What about if the association 
   contains columns that are attributes within the index? What if a record is 
   touched (ie. only updated_at changes) but no other columns are changed?
   4. Is there a way to trigger a delta-only index manually (ie. through 
   rake, or something like that) so that it can be used via a cronjob? Is that 
   a bad course of action to take?
   5. Is there a way to merge the delta index into the main index without 
   having to reindex the entire thing all over again?

Thanks!

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