Issue with dynamic_date_formats for string with epoch_millis

Hi, I'm trying to understand why "dynamic_date_formats":"epoch_millis" doesn't work.
The PUT my_index_one/_doc/1 below doesn't return. It seems to hang in Kibana Dev Console.
I expect it to return and the foo field to be mapped as a date.

PUT _template/template_1
PUT my_index_one/_doc/1
  "foo": "1574420642643"
GET my_index_one/_mapping
GET my_index_one/_doc/1

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