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Regarding to the exception you get (posted in the Slack chat) there's somthing going on with your DocumentCollection during the loop. I used the latest drop from the ODA repo on ONTF stash and not the 2.0.0 that you can download here. I assume there were changes in the DocumentIterator class in the latest version. If you set autoUpdate to false before looping thru the collection you should be fine.
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