ES 6.0 1 type 1 index issues

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This question was answered in the following post

ES6.0: multiple types, indexes, relationships puzzle

There is no way to do joins between two separate indexes in Elasticsearch. One type per index and then doing joins between those indexes is not possible and I don't see it happening in the foreseeable future. That's just not how Elasticsearch works. The only way that your use case is going to work is by normalizing to a single document type using the join field as I have described in my earlier post. To answer your first question: yes, unfortunately it's not easy to check individual child mappi…