Polish wordforms file (dictionary) for use with Sphinx Search, as it lacks official polish stemmer. Provided text file has already been stripped of duplicate wordforms.
Link to the dictionary file in an index definition in your Sphinx config (typically /etc/sphinxsearch/sphinx.conf).
wordforms = /path/to/pl_PL.UTF-8.txt
Apart from applying wordforms file into your Sphinx config, you must make sure that polish letters are considered valid keywords part.
Polish charset_table from official Sphinx wiki:
charset_table = 0..9, A..Z->a..z, a..z, U+0143->U+0144, U+0104->U+0105, U+0106->U+0107, U+0118->U+0119, U+0141->U+0142, U+00D3->U+00F3, U+015A->U+015B, U+0179->U+017A, U+017B->U+017C, U+0105, U+0107, U+0119, U+0142, U+00F3, U+015B, U+017A, U+017C, U+0144