Enterprise app search duplicate engine data documents

We are using Enterprise app search to ingest some documents into the engine.
Now we want the same engine documents duplicated into a different engine. Is there a copy and paste the data in one engine to another new engine via Rest Api call ?

Does anybody know is this feature available in App search ?

I don't think there's a way to do this within App Search, but what you could do is use the Elasticsearch reindex functionality to copy it to a new index, and then build an Elasticsearch index based engine on top of that.

App Search Engines usually uses an underlying elastic index. so you can copy from one index to the other (both underlying indexes of two engines) using reindex api.

POST _reindex
"source": {
"index": "index1"
"dest": {
"index": "index2"

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