Migrate ElasticSearch Data from 0.9 (embedded) to 7.x (standalone)

I'm quite a newbie when it comes to ElasticSearch. I had to update a project from the version 0.9 to 7.x everything went smoothly but now I have a little problem: How can I migrate the data from the old embedded Elasticsearch to the new standalone one?

For people who were already using the project with the old version of Elasticsearch, they have millions of document and I need to make the upgrade transparent. We are using the Java API to initially populate the indexes but I don't think I can do that since they still have to use the old files while all the data is not transferred to the new one. Once the new elasticsearch is populated we will be able to upgrade the files.

How can I do? Thank you for your help, I'm pretty stuck.

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