Hi, I am new to lucene and I get a simple question about index reader.
If I open a DirectoryReader say reader1 based on a disk directory, then the lucene index directory is changed, to get new result I need get a new DirectoryReader. Suppose reader1 will get the result before the change forever. I am wondering how lucene can guarantee reader1's result is not changed. If I delete all docs from the folder after reader1 is opened, after optimize the directory should be empty now, how can reader1 still get old result?
