I offer commercial development support for Xapian since 2014. I have developed the following capabilities in Xapian commercially:
- Decoupled indexing and text extraction, which drastically reducing indexing time.
- Enabled indexing of images using tesseract.
- I have designed and implemented a heuristic algorithm to extract table from images.
- I have implemented the Language Modelling based ranking scheme in Xapian (GSOC).
- I have developed an evaluation framework for Xapian.