I have added a useful new feature to HyperTag: Semantic search for text documents (including PDF's and epub's). It is powered by DistilBERT (transformer) using the awesome https://github.com/UKPLab/sentence-transformers lib.
It works like this:
Install: $ pip install hypertag
Import text documents: $ hypertag import path/to/directory
Build the index: $ hypertag index
And search: $ hypertag search "your important text query"
Hope any of you find it useful. And always keen on feedback!