# Elasticsearch multi-match query using a fuzziness criteria behaves in a strange way
**URL:** https://discuss.elastic.co/t/elasticsearch-multi-match-query-using-a-fuzziness-criteria-behaves-in-a-strange-way/319498
**Category:** Elasticsearch
**Created:** [November 21, 2022, 9:56pm UTC](https://discuss.elastic.co/t/elasticsearch-multi-match-query-using-a-fuzziness-criteria-behaves-in-a-strange-way/319498 "2022-11-21T21:56:44Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Ivo\_Tavares](https://discuss.elastic.co/u/Ivo_Tavares)
#### Post date: [November 21, 2022, 9:56pm UTC](https://discuss.elastic.co/t/elasticsearch-multi-match-query-using-a-fuzziness-criteria-behaves-in-a-strange-way/319498/1 "2022-11-21T21:56:44Z")
I'm trying to search for some files using the function `fetch_document` to fetch a document by its name in the `data.name` subfield.
This function is being used in the following way:
```
fetch_document(
client=server,
doc_name="gartner",
)
```
and it returns documents named 'Caroline Gardner', 'Rödl & Partner', 'Mio Partner', or even a 'Bidding Mart Partner'... I find this behaviour strange, and would like to understand why it happens.
Below is the query the function `fetch_document` uses to get those results.
For that, we use the following criteria:
```
def query_criteria(query: str, field:str,fuzziness:str = "AUTO:6,12"):
fields =[f"data.{field}^2", f"data.{field}.tokenized"]
return dsl.Q(
"multi_match",
query=query,
fields = fields,
type="best_fields",
fuzziness=fuzziness,
fuzzy_transpositions=True,
minimum_should_match= "100%"
)
query = CompanyCluster.search(
using=client,
index = index
).extra(size=1)
query = query.query(dsl.Q("bool",
# usually this should field would be a list with several query_criteria
should = [query_criteria(var_name, "name", fuzziness="AUTO:6,12")],
minimum_should_match = 1
# this is equal to list length in the should field
))
res = query.execute()
```
The `data.name` subfield has the following mapping:
```auto
name = dsl.Text(analyzer=_tag_analyzer, fields={"raw": dsl.Keyword(), "tokenized": dsl.Text(analyzer=_tokenized_tag_analyzer)})
```
the tag analysers that I'm using are the following:
```auto
_tag_analyzer = dsl.analyzer('tag_analyzer',
tokenizer="keyword", # Never split tags
char_filter=[_special_symbol_filter],
filter=["lowercase"] # Since we already removed everything, we only need to lowercase the text
)
_tokenized_tag_analyzer = dsl.analyzer('tokenized_tag_analyzer',
tokenizer=dsl.tokenizer("whitespace_dash", type="char_group", tokenize_on_chars=["whitespace", "-"]), # Split on whitespace & dash -
char_filter=[_special_symbol_filter_2],
filter=["lowercase", "stop"]
)
```
the special symbol filters simply remove numbers, whitespaces and dashes.
The way I'm understanding the fuzziness criteria `fuzziness:str = f"AUTO:{x},{y}"` is that for tokens(in this case words) of length `x` we're willing to have a distance of 1, and for tokens of length `y` we're willing to have a distance of 2.
Given all this information, I simply don't see how the `minimum_should_match= "100%"` allows for a match with just 1 word (gartner -\> gardner is just at a distance of 1 character change).
---
### Author:  [@RabBit\_BR](https://discuss.elastic.co/u/RabBit_BR)
#### Post date: [November 21, 2022, 10:42pm UTC](https://discuss.elastic.co/t/elasticsearch-multi-match-query-using-a-fuzziness-criteria-behaves-in-a-strange-way/319498/2 "2022-11-21T22:42:35Z")
> [@Ivo\_Tavares](#):
>
> and it returns documents named 'Caroline Gardner', 'Rödl & Partner', 'Mio Partner', or even a 'Bidding Mart Partner'... I find this behaviour strange, and would like to understand why it happens.
You have fuzziness= "AUTO:6,12", if Im not wrong (please Team Elastic correct me if Im wrong):
Term length 0 until 5 = only match exactly
Term length 6 until 12 = you have one edition
Term length \> 12 = you have two edition
Your term has length 7, so you have one edition. Thus, received 'Caroline Gardner', 'Rödl & Partner', 'Mio Partner' and 'Bidding Mart Partner' not seems wrong.
---
### Author:  [@Ivo\_Tavares](https://discuss.elastic.co/u/Ivo_Tavares)
#### Post date: [November 23, 2022, 12:40am UTC](https://discuss.elastic.co/t/elasticsearch-multi-match-query-using-a-fuzziness-criteria-behaves-in-a-strange-way/319498/3 "2022-11-23T00:40:37Z")
Thanks 😉
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [December 21, 2022, 12:40am UTC](https://discuss.elastic.co/t/elasticsearch-multi-match-query-using-a-fuzziness-criteria-behaves-in-a-strange-way/319498/4 "2022-12-21T00:40:59Z")
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