Empty search results using a merged index

[keren nutch]

I merged 20 seperate indexes into a master index. After I pointed to the master 
index, I got 
empty search results. I looked at catalina.out, it says as follows.
 
 060302 092418 13 query request from 127.0.0.1
 060302 092418 13 query: canada
 060302 092418 13 searching for 20 raw hits
 060302 092419 13 total hits: 1319570
 
 It seemed that tt got results. Please let me know why I got empty 
search results.
 
 Best regards,
 Keren
 
                
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