Github user synhershko commented on a diff in the pull request:

    https://github.com/apache/lucenenet/pull/172#discussion_r71072078
  
    --- Diff: src/Lucene.Net.Tests/core/Index/TestBinaryDocValuesUpdates.cs ---
    @@ -1109,25 +1109,55 @@ public virtual void 
TestUpdateBinaryDVFieldWithSameNameAsPostingField()
             [Test]
             public virtual void TestUpdateOldSegments()
             {
    -            Codec[] oldCodecs = new Codec[] { new Lucene40RWCodec(), new 
Lucene41RWCodec(), new Lucene42RWCodec(), new Lucene45RWCodec() };
    +            OLD_FORMAT_IMPERSONATION_IS_ACTIVE = true;
    +            Codec[] oldCodecs = new Codec[] {
    +                new Lucene40RWCodec(OLD_FORMAT_IMPERSONATION_IS_ACTIVE),
    +                new Lucene41RWCodec(OLD_FORMAT_IMPERSONATION_IS_ACTIVE),
    +                new Lucene42RWCodec(OLD_FORMAT_IMPERSONATION_IS_ACTIVE),
    +                new Lucene45RWCodec(OLD_FORMAT_IMPERSONATION_IS_ACTIVE)
    +            };
                 Directory dir = NewDirectory();
     
    -            bool oldValue = OLD_FORMAT_IMPERSONATION_IS_ACTIVE;
                 // create a segment with an old Codec
                 IndexWriterConfig conf = 
NewIndexWriterConfig(TEST_VERSION_CURRENT, new MockAnalyzer(Random()));
                 conf.SetCodec(oldCodecs[Random().Next(oldCodecs.Length)]);
    -            OLD_FORMAT_IMPERSONATION_IS_ACTIVE = true;
                 IndexWriter writer = new IndexWriter(dir, conf);
                 Document doc = new Document();
                 doc.Add(new StringField("id", "doc", Store.NO));
                 doc.Add(new BinaryDocValuesField("f", ToBytes(5L)));
                 writer.AddDocument(doc);
                 writer.Dispose();
    +            dir.Dispose();
    +
    +            OLD_FORMAT_IMPERSONATION_IS_ACTIVE = false;
    --- End diff --
    
    why do you set this here? If I read the original code correctly, this isn't 
needed


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