Improve performance and memory requirements (ongoing)
Keep up with new Lucene versions (ongoing)
Scale to larger corpora by adding support for distributed search, through integration with Solr (2022)
Make the content store optional, and make it easier for applications to provide their own way of accessing the original content (for hits highlighting). (2022)
Add support for tree-like structures to enable e.g. treebanks-like searches.
Add support for parallel corpora
Integrate improvements and suggestions from the community (issues and pull requests welcome!)