Ingest node different types

Is there a way to send a document via ingest node to multiple types?
I need to reindex documents so that part of the document becomes a parent and the other part a child, all the stuff I tried till now has failed.
My last resort is to reindex all the documents twice, once for the parents and one for the children (very not optimal for I am indexing billions of documents)
My question is if there is a way to convert one document to multiple docs, or if there is a way to connect two pipelines (so that each document will go into both pipelines)

Thank you so much for your answer :slight_smile:

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