Searching for words without hyphen, which have a hyphen in the catalog

[amenk]

Problem: Users search for words without a hypen (Kinball), and expect to find Kin-ball

Compare

https://www.kuebler-sport.de/catalogsearch/result/?q=kinball

This gives only to mostly-unrelated results

https://www.kuebler-sport.de/catalogsearch/result/?q=kin-ball

gives better results

How can this be solved? Should we filter out the hyphen in the analyzer?

Approach:

I think I could filter:

https://stackoverflow.com/a/67283966/288568

But how do I define such a custom char filter in elasticsuite:

    "char_filter": {
      "ngram_mappings_char_filter": {
        "type": "mapping",
        "mappings" : ["-=>_"]
      }
    },

this does not work in elasticsuite_analysis.xml:

<?xml version="1.0"?>
<analysis xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="urn:magento:module:Smile_ElasticsuiteCore:etc/elasticsuite_analysis.xsd">
    <filters>
        <filter name="ngram" type="ngram" language="default">
            <min_gram>4</min_gram>
            <max_gram>15</max_gram>
        </filter>
    </filters>

    <analyzers>
        <analyzer name="ngram" tokenizer="standard" language="default">
            <filters>
                <filter ref="ascii_folding" />
                <filter ref="trim" />
                <filter ref="word_delimiter" />
                <filter ref="lowercase" />
                <filter ref="elision" />
                <filter ref="ngram" />
            </filters>
            <char_filters>
                <char_filter ref="html_strip" />
                <char_filter ref="pattern_replace">
                    <pattern>-</pattern>
                    <replacement></replacement>
                </char_filter>
            </char_filters>
        </analyzer>
    </analyzers>
</analysis>

Element 'char_filter': Element content is not allowed, because the content type is empty.