Documentation - Wildcard query DSL

Running on ES 7.10.0.

Sending a search query with "case_insensitive" parameter:
Getting response [wildcard] query does not support [case_insensitive]
as in documentation -> Wildcard query | Elasticsearch Guide [8.8] | Elastic is should be supported since [7.10.0]

Dont want to change the mapping and keep in index values with cases, but when searching i want to take into account lowercase value. I'm looking for the best option to find equivalent to 'contains' query which is pretty much non-existent in ES engine, couldn't find anything out of the box.

Query below:

GET test/_search
  "query": {
    "wildcard": {
      "code.keyword": {
        "value": "*",
    "case_insensitive": true

7.8.0 is EOL and no longer supported. Please upgrade ASAP.

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ok can be closed, seems like wrong version of ES was provided. Will do rolling upgrade and check with latest.

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