Hi Bruno Michels,
By default we append the changed item to the IIndexerInfo list. The version of a given item is not removed until you run the entire index from Sitefinity >> Administration >> Search or do it programmatically. If we update the entire index on each update this will cause some performance issues ( you can see the indexing execution time when you run in from Sitefinity >> Administration >> Search - it could take 1 minute if you have over 5000 items)
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