Elastic text search with umlauts and special characters

[thomas-sc]

The current full text search is not tolerant of special characters and umlauts. For example, a search for “Straße” will not find “Strasse” and ‘Kornel’ will not find “Kornél”.

There is a simple and a more professional solution.
The simple solution would be to set ASCII folding filters as analyzers in Elastic.
The more sophisticated variant would be the ICU plugin, which must first be installed as an Elastic plugin. This would be more suitable than ASCII folding for more complex requirements, especially for multilingual content.