Heya,
We just released analysis stempel plugin 1.6.0 for elasticsearch: https://github.com/elasticsearch/elasticsearch-analysis-stempel
It now supports polish_stem token filter: https://github.com/elasticsearch/elasticsearch-analysis-stempel/pull/3
Enjoy!
--
David Pilato | Technical Advocate | Elasticsearch.com
@dadoonet | @elasticsearchfr | @scrutmydocs