CQ 5 Tag Search with German special characters

Hi all,

I configured CQ 5.5. to do search on a set of custom tags that I created for documents. I did that by adding some new tags in /etc/tags/custom and adding this path in /apps/dam/content/search/searchpanel/facets/tagoptions. I noted that search works fine for any new tag that I created except those tags which contain German characters like küche. Can anyone help here on what could be the issue ?

Thanks!