Case_insensitive not working on wildcard field type with cyrilic data

Elastic Stack Elasticsearch
1

Hello,

When you have an index with field that its type is wildcard and its filled with Cyrillic data and then when you perform wildcard query with case_insensitive: true, no documents are found.

Note: we are currently using version 7.17.8

Test example:

PUT /index
{
  "mappings": {
    "properties": {
      "name": {
        "type": "wildcard"
      }
    }
  }
}

POST /index/_doc/1
{
  "name": "ТЕСТ"
}

POST /index/_search
{
  "query": {
    "bool": {
      "must": [
        {
          "wildcard": {
            "name": {
              "value": "*Тест*",
              "case_insensitive": true
            }
          }
        }
      ]
    }
  }
}

I tried to search for a fix but could not find anything. Is there anything that can help us solve this issue?

NOTE: Index data and query data are all the Cyrillic characters.

Cyrilic:

ТЕСТ - 0xd0a2d095d0a1d0a2
Тест - 0xd0a2d0b5d181d182

While latin would be:

TECT - 0x54454354
Tect - 0x54656374

2

Hi Irfan,
Adding case insensitivity for all languages/scripts is a big prospect which is why the functionality is limited to the ASCII set of characters for now. See docs here

1 Like
3

Hey @Mark_Harwood1, thanks for the response.
Do you know when Elastic is planing to expand support to other characters?

4

No, sorry

1 Like
5

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