[BUG]JsonEnum cannot recognize uppercase during deserialization.

[lihuimingxs]

What is the bug?

JsonEnum deserialization employs a lookupTable, which is a Map<String, T>.

In the deserialize method, the corresponding enumeration is obtained through the method this.lookupTable.get(value).

A problem arises regarding the case sensitivity of strings:

If the value in the enumeration class is lowercase, and uppercase letters are used in the DSL, an error will be reported. However, the DSL permits the use of uppercase letters. This can be quite confusing for developers.

How can one reproduce the bug?

Taking ZerotermsQuery as an example:

@JsonpDeserializable
public enum ZeroTermsQuery implements JsonEnum {
    All("all"),
    None("none");

    private final String jsonValue;
    public static final JsonEnum.Deserializer<ZeroTermsQuery> _DESERIALIZER = new JsonEnum.Deserializer(values());

    private ZeroTermsQuery(String jsonValue) {
        this.jsonValue = jsonValue;
    }

    public String jsonValue() {
        return this.jsonValue;
    }
}

DSL:

GET test_index/_search
{
  "query": {
    "match": {
      "text": {
          "fuzziness": "AUTO",
          "auto_generate_synonyms_phrase_query": true,
          "query": "product manager",
          "zero_terms_query": "NONE",
          "fuzzy_transpositions": true,
          "boost": 1.0,
          "prefix_length": 0,
          "operator": "OR",
          "lenient": false,
          "max_expansions": 50
      }
    }
  }
}

That will be thrown JsonparsingException when executing the anti sequence method.

public T deserialize(String value, JsonParser parser) {
            T result = (JsonEnum)this.lookupTable.get(value);
            if (result == null) {
                throw new JsonParsingException("Invalid enum '" + value + "'", parser.getLocation());
            } else {
                return result;
            }
        }

What is the expected behavior?

case-insensitive.

What is your host/environment?

Operating system, version.

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Do you have any additional context?

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