https://access.redhat.com/webassets/avalon/d/red_hat_build_of_keycloak-26/javadocs/org/keycloak/theme/DefaultThemeManagerFactory.ThemeKey.html
DefaultThemeManagerFactory.ThemeKey (Keycloak Docs Distribution 26.0.17.redhat-00001 API)
declaration: package: org.keycloak.theme, class: DefaultThemeManagerFactory, class: ThemeKey
keycloakdocsdistribution