Understanding Analysis in Elasticsearch (Analyzers)
Filter on Token Attributes - LimeSurvey forums
Developing Custom Filter Plugin in Lucene (Solr 8+) | by Akshay Tiwari | Medium
Custom Filters | Couchbase Docs
Provide Field item that supports Text Filters [#2037473] | Drupal.org
GitHub - francesconero/elasticsearch-concatenate-token-filter: Elasticsearch plugin which only provides a TokenFilter that merges tokens in a token stream back into one. Taken from http://elasticsearch-users.115913.n3.nabble.com/Is-there-a ...
How to hide a token from your Portfolio – Klever Support