public async Task GlobalSetup()
        {
            _path = Guid.NewGuid().ToString();

            var plain = await PlainIndex();

            _lmdb = new LmdbIndex(_path);

            foreach (var field in plain.Fields)
            {
                _lmdb.AddField(field);
            }

            foreach (var(k, v) in plain.FieldVectors)
            {
                _lmdb.AddFieldVector(k, v);
            }

            foreach (var(k, v) in plain.InvertedIndex)
            {
                _lmdb.AddInvertedIndexEntry(k, v);
            }

            Index = new DelegatedIndex(_lmdb, plain.Pipeline);
        }
        private DelegatedIndex CopyIndex(Lunr.Index index)
        {
            var path = _tempDir.NewDirectory();

            var lmdb = new LmdbIndex(path);

            foreach (var field in index.Fields)
            {
                Assert.True(lmdb.AddField(field));
            }

            foreach (var(k, v) in index.FieldVectors)
            {
                Assert.True(lmdb.AddFieldVector(k, v));
            }

            foreach (var(k, v) in index.InvertedIndex)
            {
                Assert.True(lmdb.AddInvertedIndexEntry(k, v));
            }

            var idx = new DelegatedIndex(lmdb, index.Pipeline);

            return(idx);
        }