How to create and add nested object into nested field in Elasticsearch?

https://www.elastic.co/guide/en/elasticsearch/reference/5.4/modules-scripting-painless-syntax.html#painless-maps

You can create a map like ['first': 'Foo', 'last': 'Bar', 'sthElse': 100] then add it.

So:

ctx._source.user.add([
    "first" : "Foo",
    "last" : "Bar"
])

Please note that map in painless can be mixed type.

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