Is is possible to term query with asciifolding? - elasticsearch

Question

I would need to match the whole field but using lowercase and asciifolding token filters. Is this possible in Elasticsearch?
For example, if I have a "Title" field for products and the product title is "Potovalni Kovček". And the user search query is "potovalni kovcek" then I need to return this product as the result. But only if the whole title matches the search query. If the user search query is "potovalni" or "Potovalni" or "kovcek" no results should be returned.
Can I create a term query with lowercase and asciifolding token filters? I couldn't figure out how to do that.

Answer 1

What I would do is to define the title field as a keyword and use a custom normalizer to do the job.
First let's create the index:
PUT test
{
"settings": {
"analysis": {
"normalizer": {
"exact": {
"type": "custom",
"filter": [
"lowercase",
"asciifolding"
]
}
}
}
},
"mappings": {
"doc": {
"properties": {
"title": {
"type": "keyword",
"normalizer": "exact"
}
}
}
}
}
Then, we index a sample document:
PUT test/doc/1
{
"title": "Potovalni Kovček"
}
Finally, we can search:
# Record 1 is returned
POST test/_search
{
"query": {
"term": {
"title": "Potovalni Kovček"
}
}
}
# Record 1 is returned
POST test/_search
{
"query": {
"term": {
"title": "potovalni kovcek"
}
}
}
# No record is returned
POST test/_search
{
"query": {
"term": {
"title": "potovalni"
}
}
}
# No record is returned
POST test/_search
{
"query": {
"term": {
"title": "kovcek"
}
}
}