Elastic Search Basic concepts documentaton

I am going through the documentation and had seen an article in 5.3 and it never present in 7.x / 6.x version documenation. I am wondering is it still reelvant ( assuming it should as it is related to basic concepts)

https://www.elastic.co/guide/en/elasticsearch/reference/5.3/gs-basic-concepts.html

It's broadly correct, types are irrelevant.

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