Determining custom timestamp for new index does not work


I have an index which is loaded with aggregated data each day at same time, like so:

I'm trying to use logstash in order to migrate the data to another ES cluster in order to use machine learning capabilities there.

When I migrate the data the @timestamp is the time of the addition to the new index.
I don't want this behavior, and instead want to get the date of the original index from field.

For example if the aggregated document was aggregated in 9.5.2021 I want the timestamp of the document remain the same and not change to be the addition date.

[ The date format of the first index is: 05-15-2021 ]

I've tried using filter in my logstash for this cause, like so:

        mutate {
                convert => { "" => "string" }
        date {
                match => ["", "MM-dd-yyyy"]
                target => "@timestamp"

But the @timestamp still picks the current time of the addition to the new index.
Is there anything I'm missing here?

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