Copy_to termvectors is empty

Hi, I have an index with special field "all", containing the text of some others using "copy_to" mechanism. The term vectors are not copied. When I query:

GET my_index/test/_mtermvectors
"ids" : ["2802699", "3102451"],
"parameters": {
"fields": [
"term_statistics": true

I got an empty list of term vectors. How can I see term vectors (term statistics) of that field?

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