co.elastic.clients.util.MissingRequiredPropertyException: Missing required property 'PatternTokenizer.flags'

[grib0]

Java API client version

7.17.2

Java version

17

Elasticsearch Version

7.17.0

Problem description

Using the java client api, I'm unable to create an index with a this mapping

    "settings": {
        "analysis": {
            "tokenizer": {
                "espaceTiretTokenizer": {
                    "type": "pattern",
                    "pattern": "[\\s,/\\\\-]+"
                }
            }
        }
    }
}

elasticsearchClient.indices()
            .create(c -> c.index(adresseIndex)
            .withJson("settings loaded here")

I got : co.elastic.clients.util.MissingRequiredPropertyException: Missing required property 'PatternTokenizer.flags'

Trying to add ApiTypeHelper.DANGEROUS_disableRequiredPropertiesCheck(true); as explained in the doc https://www.elastic.co/guide/en/elasticsearch/client/java-api-client/7.17/missing-required-property.html results in java.lang.NullPointerException: Cannot invoke "java.lang.Integer.intValue()" because the return value of "co.elastic.clients.util.ApiTypeHelper.requireNonNull(Object, Object, String)" is null

The workaround is to add the 2 properties flags and group but this properties should be optional