Elastich search - ICU Collation Keyword Field - Norwegian language - aa elastich search consider as å when sorting

I am using elastic search elasticsearch:6.8.4 on fos in Symfony 4.4 by friendsofsymfony/elastica-bundle": "^5.0"

I am facing an issue with sort field with config in fos_elastica.yaml. My config like:

 user_first_name_sort: {type: icu_collation_keyword, language: nb, index: true}

This work fine for Norwegian language as expected. But, word aa elastich search consider as å when sorting. Example:

How can i ignore implictly transfer?

from Elastich search - ICU Collation Keyword Field - Norwegian language - aa elastich search consider as å when sorting