# Minimum\_should\_match ignored in ES 2.4.6

**URL:** <https://discuss.elastic.co/t/minimum-should-match-ignored-in-es-2-4-6/144374>\
**Category:** Elasticsearch\
**Created:** [August 14, 2018, 4:58pm UTC](https://discuss.elastic.co/t/minimum-should-match-ignored-in-es-2-4-6/144374 "2018-08-14T16:58:04Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Elena\_DevAccount](https://avatars.discourse-cdn.com/v4/letter/e/5e9695/32.png) [@Elena\_DevAccount](https://discuss.elastic.co/u/Elena_DevAccount)\
**Post date:** [August 14, 2018, 4:58pm UTC](https://discuss.elastic.co/t/minimum-should-match-ignored-in-es-2-4-6/144374/1 "2018-08-14T16:58:04Z")

</div>

@jimczi Posted it here too!

I am getting weird behaviour with "minimum\_should\_match" used inside "multi\_match".  
ES version: 2.4.6

Plugins installed: Kibana, sense

Java version:  
java version "1.8.0\_102"  
Java(TM) SE Runtime Environment (build 1.8.0\_102-b14)  
Java HotSpot(TM) 64-Bit Server VM (build 25.102-b14, mixed mode)

OS:  
Darwin Kernel Version 17.7.0

Here's the request I am using to create the index:

```
PUT /docs 
{
    "settings": {
        "number_of_shards": 1,
        "number_of_replicas": 1,
        "index": {
            "analysis": {
            "filter": {
                "trigrams_filter": {
                    "type": "ngram",
                    "min_gram": 3,
                    "max_gram": 3
                }
            },
            "analyzer": {
                "analyzer_startswith": {
                    "tokenizer": "keyword",
                    "filter": "lowercase"
                },
                "snowball" : {
                  "type" : "snowball"
                },
                "trigrams": {
                    "type": "custom",
                    "tokenizer": "standard",
                    "filter": [
                        "lowercase",
                        "trigrams_filter"
                    ]
                }
            }
        }
    }
},
"mappings": {
    "modelresult": {
        "properties": {
          "allergies" : {
            "type" : "string",
            "analyzer" : "snowball"
          },
          "diets" : {
            "type" : "string",
            "analyzer" : "snowball"
          },
          "mealtypes" : {
            "type" : "string",
            "analyzer" : "snowball"
          },
          "medications" : {
            "type" : "string",
            "analyzer" : "snowball"
          },
          "django_ct" : {
            "type" : "string",
            "index" : "not_analyzed",
            "include_in_all" : "false"
          },
          "django_id" : {
            "type" : "string",
            "index" : "not_analyzed",
            "include_in_all" : "false"
          },
          "id" : {
            "type" : "string"
          },
          "is_published" : {
            "type" : "boolean"
          },
          "outdated" : {
            "type" : "boolean"
          },
          "source_db" : {
            "type" : "string"
          },
          "FdGrp_Cd" : {
            "type" : "string"
          },
          "original_country" : {
            "type" : "string"
          },
          "additional_information" : {
            "type" : "string"
          },
          "text" : {
            "type" : "string",
            "fields": {
              "en": {
                "type": "string",
                "analyzer": "english"
              },
              "fi": {
                "type": "string",
                "analyzer": "finnish"
              },
              "de": {
                "type": "string",
                "analyzer": "german"
              },
              "sv": {
                "type": "string",
                "analyzer": "swedish"
              },
              "general": {
                "type": "string",
                "analyzer": "trigrams"
              }
            }
          },
          "user_id" : {
            "type" : "string",
            "analyzer" : "snowball"
          },
          "homecare_area" : {
            "type" : "string",
            "analyzer" : "snowball"
          },
          "lang" : {
            "type" : "string",
            "analyzer" : "snowball"
          }
        }
    }
}
}

```

Here's the query I am running:

```
GET /docs/_search
{
  "query": {
    "filtered": {
      "filter": {
        "bool": {
          "must": [
            {
              "term": {
                "outdated": "false"
              }
            },
            {
              "term": {
                "lang": "fi"
              }
            }
          ],
          "must_not": [
            {
              "term": {
                "django_ct": "web.plantranslation"
              }
            },
            {
              "term": {
                "django_ct": "web.recipetranslation"
              }
            },
            {
              "term": {
                "django_ct": "web.fooddestranslation"
              }
            },
            {
              "term": {
                "django_ct": "web.dishtranslation"
              }
            },
            {
              "term": {
                "django_ct": "web.customerinformation"
              }
            }
          ],
          "should": []
        }
      },
      "query": {
        "bool": {
          "should": [
            {
              "span_first": {
                "boost": 10,
                "end": 1,
                "match": {
                  "span_term": {
                    "text": "makkara"
                  }
                }
              }
            }
          ],
          "must": [
            {
              "multi_match": {
                "query": "makkara",
                "type": "most_fields",
                "fields": ["text.general", "text.fi"],
                "minimum_should_match": "50%"
              }
            }
          ]
        }
      }
    }
  },
  "size": 1000
}

```

The minimum\_should\_match is being ignored in ES 2.4.6. It doesn't matter what value it is (50%, 100%), it always returns way too many results.  
This worked for ES 1.7, 2.0.1 and 2.0.2, I've tested the same query. But it's being ignored for ES 2.4.6. What is the reason? Was there some change introduced that makes "minimum\_should\_match" obsolete?

Here are some examples of the text returned results:  
legit results: MAKSAMAKKARA, BALKANMAKKARA  
wrong results: PERSIKKARAHKA, MUSTIKKAPIIRAKKA 2 KPL, LIHAPIIRAKKA 4 KPL

---

<div class="post-metadata">

**Author:** ![jimczi](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/jimczi/32/47985_2.png) [@jimczi](https://discuss.elastic.co/u/jimczi)\
**Post date:** [August 20, 2018, 10:53am UTC](https://discuss.elastic.co/t/minimum-should-match-ignored-in-es-2-4-6/144374/2 "2018-08-20T10:53:24Z")

</div>

This is caused by a change in Lucene query parser that considers each terms at the same position as synonyms. You're using an `ngram` filter that sets each ngram at the same position so `makkara` is analyzed as `mak, akk, kka, kar, ara` but each of these tokens are indexed at the same position. If you want to correctly index `ngrams` you should use an `ngram_tokenizer` which will set the correct positions for the different tokens.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [September 17, 2018, 10:53am UTC](https://discuss.elastic.co/t/minimum-should-match-ignored-in-es-2-4-6/144374/3 "2018-09-17T10:53:24Z")

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