ICU do not undiacritic
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This page explains how to configure Zebra search engine, with ICU option, to not undiacritic some characters.
Goto Zebra configuration directory : etc/zebradb.
Edit etc/words-icu.xml (and etc/phrases-icu.xml if exists).
This line defines the action of separating the diacritic and the letter (for example "ê" => "^e") :
You can configure some characters not being undiacritic. For example "å" :
<transform rule="[^å] NFD"/>
Then searching with a will not match strings with å and searching with å will not match strings with a.