1) Keep an IndexReader/Searcher open on your index in order to guarantee reed access and a consistent index during the whole process.
2) Open a new IndexReader and delete all the documents that you want to update.
3) Close the IndexReader (makes the deletions visible for any new readers/writers but not for the still opened Searcher/Reader).
But what happens when a query evaluated by the IndexReader/IndexSearcher mentioned in (1) results in a hit that has already been deleted by the second IndexReader? I.e. you try to access a document through one IndexReader that has already been deleted by another IndexReader.
I would expect some kind of exception because the document data can no longer be found, or am I missing something? I hope I am because your solution does sound very attractive ;)
Kind regards,
Chris --
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