removing _doc mapping type and replacing with default

[david-winslow]

Multiple Mapping types are no longer supported from version ES 6.00+ and will be removed completely in ES 7. The default mapping type is a placeholder.

https://www.elastic.co/guide/en/elasticsearch/reference/6.x/removal-of-types.html

[ba0708]

Thanks a lot for the PR! The type was changed to _doc in preparation for version 7.x. According to the documentation:

Indices created in 6.x only allow a single-type per index. Any name can be used for the type, but there can be only one. The preferred type name is _doc, so that index APIs have the same path as they will have in 7.0: PUT {index}/_doc/{id} and POST {index}/_doc

[manugrandio]

I think this change makes the course video slide queries to fail. The video slides weren't updated.

When the index is created with _doc, the queries made to endpoints like order/default/_search will return 0 results. When I changed defaut to _doc in the endpoint (order/_doc/_search) they worked as expected.

[ba0708]

@manugrandio You are absolutely correct that there is a slightly inconvenient transition period until I get the videos updated to use _doc. However, I encourage everyone to use _doc from the beginning of the course, and in that case people can copy and paste the queries and get the expected results. :-)

[manugrandio]

@andy0708 Thanks, I didn't remember that 🙂