Elasticsearch - pass fuzziness parameter in query_string - elasticsearch

Question

I have a fuzzy query with customized AUTO:10,20 fuzziness value.
{
"query": {
"match": {
"name": {
"query": "nike",
"fuzziness": "AUTO:10,20"
}
}
}
}
How to convert it to a query_string query? I tried nike~AUTO:10,20 but it is not working.

Answer 1

It's possible with query_strng as well, let me show using the same example as OP provided, both match_query provided by OP matches and query_string fetches the same document with same score.
And according to this and this ES docs, Elasticsearch supports AUTO:10,20 format, which is shown in my example as well.
Also
Index mapping
{
"mappings": {
"properties": {
"name": {
"type": "text"
}
}
}
}
Index some doc
{
"name" : "nike"
}
Search query using match with fuzziness
{
"query": {
"match": {
"name": {
"query": "nike",
"fuzziness": "AUTO:10,20"
}
}
}
}
And result
"hits": [
{
"_index": "so-query",
"_type": "_doc",
"_id": "1",
"_score": 0.9808292,
"_source": {
"name": "nike"
}
}
]
Query_string with fuzziness
{
"query": {
"query_string": {
"fields": ["name"],
"query": "nike",
"fuzziness": "AUTO:10,20"
}
}
}
And result
"hits": [
{
"_index": "so-query",
"_type": "_doc",
"_id": "1",
"_score": 0.9808292,
"_source": {
"name": "nike"
}
}
]

Answer 2

Lucene syntax only allows you to specify "fuzziness" with the tilde symbol "~", optionally followed by 0, 1 or 2 to indicate the edit distance.
Elasticsearch Query DSL supports a configurable special value for AUTO which then is used to build the proper Lucene query.
You would need to implement that logic on your application side, by evaluating the desired edit distance based on the length of your search term and then use <searchTerm>~<editDistance> in your query_string-query.