NightOwl888 commented on code in PR #1058:
URL: https://github.com/apache/lucenenet/pull/1058#discussion_r1997476066


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src/Lucene.Net.Memory/MemoryIndex.cs:
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@@ -275,23 +284,45 @@ public virtual TokenStream 
KeywordTokenStream<T>(ICollection<T> keywords)
             return new TokenStreamAnonymousClass<T>(keywords);
         }
 
+        /// <summary>
+        /// An anonymous implementation of <see cref="TokenStream"/> for
+        /// <see cref="KeywordTokenStream{T}(ICollection{T})"/>.
+        /// </summary>
+        /// <typeparam name="T">The type of item in the collection.</typeparam>
+        /// <remarks>
+        /// LUCENENET specific - This class originally got an enumerator in 
the constructor and stored it to a field
+        /// that was never reset, which meant that it could not be reused 
(since most IEnumerator implementations can
+        /// only be iterated once and throw on <see 
cref="System.Collections.IEnumerator.Reset()"/>). This class has

Review Comment:
   Good points. I wish Microsoft made an `IResettable` so detection would be 
easy.
   
   Given that this is a small single instance rather than an array and Lucene 
didn't even think to make it reusable in the first place, I think we can leave 
this as-is (although, let's fix the comments).



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