Lucene.Net.Index.TestIndexWriter::TestThreadInterruptDeadlock(): Adde…

…d [AwaitsFix] attribute, as this is sometimes failing (see apache#544)

src/Lucene.Net.Tests/Index/TestIndexWriter.cs

@@ -1476,6 +1476,7 @@ private string GetToStringFrom(Exception exception)
 
         [Test]
         [Slow]
+        [AwaitsFix(BugUrl = "https://github.com/apache/lucenenet/issues/544")] // LUCENENET TODO: This test occasionally fails
         public virtual void TestThreadInterruptDeadlock()
         {
             IndexerThreadInterrupt t = new IndexerThreadInterrupt(this);