At this time, there is no way to directly copy event data from one index to another. When you send an event from your FE, the index name declared in the index parameter should to be the same as the index the search was carried out on. If you’d like to enable the following features:
We recommend you start sending events from the index you are using for search as soon as possible.
If your indices have the same objectIDs, you can use the Insights API to send the events you send to from your search index to another.
* Plan restrictions apply