Fix for #506 - Prune dead elements from IndexReader.parentReaders collection when they go out of scope #509
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…ce<T> instead of WeakReference to avoid problems with garbage collection (see apache#506).
…N.Collections.Generic.Dictionary<TKey, TValue> to ConcurrentDictionary<TKey, TValue> to allow reap to function while doing a forward iteration through the collection.
…onary to ensure dead elements are pruned and garbage collected (fixes apache#506).
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Lucene.Net.Index.IndexReader: UseConditionalWeakTable<TKey, TValue>/WeakDictionary<TKey, TValue>to ensure dead elements are pruned and garbage collected (fixes IdentityWeakReference should be IDisposable #506).WeakKeyofWeakDictionary<TKey, TValue>fromWeakReferencetoWeakReference<T>.WeakDictionary<TKey, TValue>toConcurrentDictionary<TKey, TValue>to allow theClean()method to remove items while iterating forward instead of instantiating a new collection.