How to save array of nested type using Logstash?

I store an array of stacktrace rows containing multiple fields, but can't seem to make the objects as nested type.

The array looks like this and is returned by a custom ruby filter that I made:

"name": "name1",
"message": "message1"
"name": "name2",
"message": "message2"
"name": "name3",
"message": "message3"

I currently just use event.set("array-field-name", array-values) but it isn't saved as nested type in ElasticSearch

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