XContentBuilder.field : StackOverflowError with Integer[] parameters

[mstein]

After upgrading to 0.17.x from a 0.15.x version in a grails project, I've encountered a StackOverflowError when trying to add a Integer array (Integer[]) using the field() method.

Code sample to reproduce (groovy) :

  def json = jsonBuilder().startObject()
  Integer[] listofInteger = [1, 2, 3, 4]
  json.field("test2", listofInteger)
  json.endObject()

Error returned :

Caused by: java.lang.StackOverflowError
at org.elasticsearch.common.xcontent.XContentBuilder.field(XContentBuilder.java:568)
at org.elasticsearch.common.xcontent.XContentBuilder.field(XContentBuilder.java:601)
at org.elasticsearch.common.xcontent.XContentBuilder.field(XContentBuilder.java:601)
at org.elasticsearch.common.xcontent.XContentBuilder.field(XContentBuilder.java:601)
   (...)

It will also occured when using a Float[] or Double[].
Building the array manually with the array() method will not trigger the error :

  def json = jsonBuilder().startObject()
  Integer[] listofInteger = [1, 2, 3, 4]
  json.startArray("test2")
  for (Object o : listofInteger) {
      json.value(o);
  }
  json.endArray()
  json.endObject()

The line https://github.com/elasticsearch/elasticsearch/blob/master/modules/elasticsearch/src/main/java/org/elasticsearch/common/xcontent/XContentBuilder.java#L631 is probably the reason of the issue since an Integer[] will be recognized as a Object[], and will just infinitely call the field(String, Object) method.