Modify field type when merging index

Hello,
I am trying to merge daily indexes into monthly indexes, but I get some errors like

"reason":"mapper [event.data.playback.progress] cannot be changed from type [long] to [float]"},"status":400}

In my application, I know the type for example event.data.playback.progress should be [long], so is there a way to convert this when importing the document so it has the correct type?

any advice is much appreciated

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