Convert a string field to number, but only brand new indices recognized

Logstash version: 6.3.0

Here is my config:

mutate {
    convert => { "bytes_sent" => "integer" }

I find that a indice which first created can recognized the config, but the others ones can not, even they created erveryday with different date suffix.

For example, there are some indices with same prefix like:


I guess I should delete all the indices with the same prefix to make the convert config recognized?

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