Multi-level nested sort in elasticsearch v5.5

Hello,
I am using elasticsearch v5.5, and trying to build a sort query, sorted by 3 level nested field.
In https://www.elastic.co/guide/en/elasticsearch/reference/5.5/search-request-sort.html, there is an example on sorting by 2 level nested field.

POST /_search
{
   "query" : {
      "term" : { "product" : "chocolate" }
   },
   "sort" : [
       {
          "offer.price" : {
             "mode" :  "avg",
             "order" : "asc",
             "nested_path" : "offer",
          }
       }
    ]
}

And to convert to Java, it is like
FieldSortBuilder sortBuilder = new FieldSortBuilder("offer.price").order(SortOrder.ASC)
.setNestedPath("offer");

What if I want to sort by 3 level nested field (say: parent.child.age) in elasticsearch v5.5? And what is the corresponding Java builder format?

Thanks!

P.S. I saw multi-level nested sorting example (sort by parent.child.age, which is a 3 level sort) on elasticsearch v6.1 and onward. Can you also provide an example on v5.5

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