How to include diacritic words(ex- PVÖL) in search response

Hi,
I have documents which have words like PVÖL.
But they are not included in the search.

here is my mapping:

{
"mappings":{
"dynamic"=false,
"properties":{
"street":{"type":"search_as_you_type","analyzer":"diacritic"}
}
}
"settings" : {
        "analysis" : {
            "analyzer" : {
                "default" : {
                    "tokenizer" : "standard",
                    "filter" : ["asciifolding","lowecase"]
                }
            }
        }
    }