You are probably looking for ICU Folding which is part of ICU plugin:
https://github.com/elasticsearch/elasticsearch-analysis-icu . It's not
explained in details on that page, but you can see a long list of
normalizations from the Lucene's Javadoc:
http://www.solr-start.com/javadoc/solr-lucene/org/
I now the asciifolding filter docs are really very clear on this, but it
took me an embarrassingly long time to realise I was losing my currency
symbol (£) to the ASCII folding filter.
Other than creating my own character map with the char map filter, does
there exist something of production qu
