SimpleFSDirectoryFactory build a bad root of the index

[MateosTDD]

SimpleFSDirectoryFactory mount a bad route of the index because add the name of the index to _options.IndexesDirectory, and after search the index inside of that folder

Example:
I create a index called 'product's and it produces that I have a index called 'products.index.json' in the folder 'app/indexes'

The problem is that the class SimpleFSDirectoryFactory search that index in the folder 'app/indexes/products' and not 'app/indexes'

The error is this piece of code

  public Directory GetDirectory(string indexName)
  {
      indexName = indexName.ToLowerInvariant();

      if (_directories.TryGetValue(indexName, out var directory))
      {
          return directory;
      }

      **var path = Path.Join(Path.GetFullPath(_options.IndexesDirectory), indexName.ToLowerInvariant());**

      directory = new SimpleFSDirectory(path);

      _directories.TryAdd(indexName, directory);

      return directory;
  }

I think that path must be _options.IndexesDirectory without the join method