Lucene.Net.Analysis.ChainedFilterTest.TestWithCachingFilter C# (CSharp) Method

        public void TestWithCachingFilter()
        {
            Directory dir = new RAMDirectory();
            Analyzer analyzer = new WhitespaceAnalyzer();

            IndexWriter writer = new IndexWriter(dir, analyzer, true, IndexWriter.MaxFieldLength.LIMITED);
            writer.Close();

            Searcher searcher = new IndexSearcher(dir, true);

            Query query = new TermQuery(new Term("none", "none"));

            QueryWrapperFilter queryFilter = new QueryWrapperFilter(query);
            CachingWrapperFilter cachingFilter = new CachingWrapperFilter(queryFilter);

            searcher.Search(query, cachingFilter, 1);

            CachingWrapperFilter cachingFilter2 = new CachingWrapperFilter(queryFilter);
            Filter[] chain = new Filter[2];
            chain[0] = cachingFilter;
            chain[1] = cachingFilter2;
            ChainedFilter cf = new ChainedFilter(chain);

            // throws java.lang.ClassCastException: org.apache.lucene.util.OpenBitSet cannot be cast to java.util.BitSet
            searcher.Search(new MatchAllDocsQuery(), cf, 1);
        }