elasticsearchelastic-stackelasticsearch-dsl

What is the alternative of lowercase_expanded_terms in Elastic search 8.9?

I know that lowercase_expanded_terms is valid in 2.x version and if the same is tried to execute in 8.9v gives "reason": "[query_string] query does not support [lowercase_expanded_terms]".

{
  "size": 1000,
  "query": {
    "bool": {
      "must": [
        {
          "query_string": {
            "query": "*TEST*",
            "fields": [
              "elastic*"
            ],
            "lowercase_expanded_terms": false // query does not support
          }
        }
      ]
    }
  }
}
Solution

  • lowercase_expanded_terms has been removed around5.0.

    Instead you should lowercase your tokens at indexing time using a lowercase token filter in your field analyzer or normalizer.

    As a result you'll be able to search for *test* instead of the uppercase version *TEST*.