I intend to use nutch with a fairly complex structure of subcollections. I
did some tests and the storage/search performs as expected; however there is
an aspect I may have neglected and cannot find an answer. 

How/at which stage are subcollections added to the index structure?

I plan on crawling frequently, adding new sites to existent repository,
merging/reindexing as needed. However if I need to change the subcollection
structure (ie. add a site to a newly created subcollection) I don't want to
recrawl it again. I hope it can be done by simply using the existent/crawled
data.

I tried the following: fetch/index some sites using subcollection1.xml. Then
change to subcollection2.xml. Then reindex - nothing happens in terms of
collections. Same if I do a updatedb/reindex.

Can you please point me something to look at? I am fairly poor in java, and
I hope I won't need to change the source code. Although the need to 
"inject" somehow the new names for subcollection field looks rather
peculiar.

Thanks
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