mtermvectors with artificial documents fails when deserializing response

[spacelore]

Java API client version

8.14.1

Java version

21

Elasticsearch Version

8.14.1

Problem description

This is related to #716 as although no error occurs when submitting the request when using artificial documents now, there is an error when retrieving the response

POST /_mtermvectors
{
  "docs": [
    {
      "_index": "myIndex",
      "doc": {
        "foo" : "bar"
      }
    }
  ]
}

Caused by: co.elastic.clients.util.MissingRequiredPropertyException: Missing required property 'MultiTermVectorsResult.id'
    at co.elastic.clients.util.ApiTypeHelper.requireNonNull(ApiTypeHelper.java:76) ~[elasticsearch-java-8.14.1.jar:?]
    at co.elastic.clients.elasticsearch.core.mtermvectors.MultiTermVectorsResult.<init>(MultiTermVectorsResult.java:90) ~[elasticsearch-java-8.14.1.jar:?]
    at co.elastic.clients.elasticsearch.core.mtermvectors.MultiTermVectorsResult.<init>(MultiTermVectorsResult.java:67) ~[elasticsearch-java-8.14.1.jar:?]

The code still has id as required although it is not returned in the response when using artificial documents

private MultiTermVectorsResult(Builder builder) {

    this.id = ApiTypeHelper.requireNonNull(builder.id, this, "id");
    this.index = ApiTypeHelper.requireNonNull(builder.index, this, "index");
    this.version = builder.version;
    this.took = builder.took;
    this.found = builder.found;
    this.termVectors = ApiTypeHelper.unmodifiable(builder.termVectors);
    this.error = builder.error;

}

[l-trotta]

see #839