Is the new join datatype available in 6 alpha yet?

I want to test out what changes we will need to make in version 6 when parent/child relationships are to be replaced with the new "join" data type. I downloaded elasticsearch-6.0.0-alpha2 and tried the example in the documentation:
But I get the following error message:

Failed to parse mapping [doc]: [relations] expected string but was:LinkedHashMap

Anyone had any success with the new "join" data type, or is it not ready to use yet?

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