Jim Ferenczi ccb3c9aae7 Add documentation for the new parent-join field (#25227)
* Add documentation for the new parent-join field

This commit adds the docs for the new parent-join field.
It explains how to define, index and query this new field.

Relates #20257
2017-06-16 11:13:23 +02:00
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2016-07-04 11:02:06 +02:00
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