sort and updating indexes

[Paladin <pa...@club-internet.fr>]

Hi.
i use lucene to index a base with 3 millions of articles and i have a problem with the sort and to update my indexes. 
for exemple i have 4 articles :
a,b,c,d> 
and i want to update the b and put an article =22e=22 i delete the b and i put in my indexes the update b and the e 
so the order in my index is :
a,c,d,b,e.

when i search my articles i want them to be sort by their number and to avoid a large mount of memory i use the fonction sortfield with the type at 1 to have my result in the index order (document number).
Of course after an updating my index order means nothing...
 
so this is my question : is it possible to do a sort on the index after an updating to have a correct order ?
 
i hope i was clear (forgive my poor english..)

thanks in advance