How to use copy_to on a nested field

Elastic Stack Elasticsearch
1

Is it possible to use copy_to in a nested field :

Here is an extract of my mapping :

day: {
type: nested
properties: {
weight: {
index_name: bzixtz2fng.day.weight
type: double
}
value: {
index_name: bzixtz2fng.day.value
type: string
copy_to: [
raw_words
back
]
}
}
}

Why I don't find my doc when I search on back

{
"query": {
"term": {
"back": "one"
}
}
}

PS : Version 1.0.1

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