Parent-child document structure

Parent-child document structure compatibility to migrate data from elasticsearch5.6.9 to elasticsearch6, Please help me solutions to migrate data(re-index).

This post should help you with that: Dec 15th, 2017: [EN][Elasticsearch] Going from multiple types to one type with the Reindex API

One thing: the post is a little bit outdated as it recommends using doc as the new document type. Nowadays, it's recommended to use _doc instead, as that will make future migrations to version 7 easier.

Thanks a lot, It work's for me.

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