Your query should be:

Query diInLuceneQuery = DIInQB.keyword()
                .onField("docPath")
                .ignoreFieldBridge()
                .matching(s.toLowerCase())
                .createQuery();

You don't want the field bridge be applied to your search terms. Field bridges are applied to allow passing things like Boolean_s or _Date_s etc to _matching. The field bridge is then used to convert the object to a string needed for the search.

Could you please try this and let us know if it works?

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