Elasticsearch - Special Characters in Query String - elasticsearch

Question

I'm having trouble trying to search special characters using query string. I need to search an email address in format "xxx#xxx.xxx". At index time I use a custom normalizer which provide lowercase and ascii folding. At search time I use a custom analyzer which provide a tokenizer for whitespace and a filter that apply lowercase and ascii folding. By the way I am not able to search for a simple email address.
This is my mapping
{
"settings": {
"number_of_shards": 5,
"number_of_replicas": 1,
"analysis": {
"analyzer": {
"folding": {
"tokenizer": "whitespace",
"filter": [
"lowercase",
"asciifolding"
]
}
},
"normalizer": {
"lowerasciinormalizer": {
"type": "custom",
"filter": [
"lowercase",
"asciifolding"
]
}
}
}
},
"mappings": {
"properties": {
"id": {
"type": "integer"
},
"email": {
"type": "keyword",
"normalizer": "lowerasciinormalizer"
}
}
}
And this is my search query
{
"query": {
"bool": {
"must": [
{
"query_string": {
"query": "pippo#pluto.it",
"fields": [
"email"
],
"analyzer": "folding"
}
}
]
}
}
}
Searching without special characters works fine. Infact if I do "query": "pippo*" I get the correct results.
I also tested the tokenizer doing
GET /_analyze
{
"analyzer": "whitespace",
"text": "pippo#pluto.com"
}
I get what I expect
{
"tokens" : [
{
"token" : "pippo#pluto.com",
"start_offset" : 0,
"end_offset" : 15,
"type" : "word",
"position" : 0
}
]
}
Any suggestions?
Thanks.
Edit:
I'm using elasticsearch 7.5.1
This works right. My problem was somewhere else.