Github user NightOwl888 commented on the issue:
https://github.com/apache/lucenenet/pull/205
@pvginkel
Could you add a test to this PR in the [TestDirectory
class](https://github.com/pvginkel/lucenenet/blob/synchronized-stale-files/src/Lucene.Net.Tests/Store/TestDirectory.cs)
that fails with the current HashSet and passes with the ConcurrentHashSet? Not
that I don't believe you fixed it, but for future porting efforts it would help
if we don't repeat the same bugs over and over again.
Please mark the test with the `[LuceneNetSpecific]` attribute.
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