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
..
2017-05-04 21:01:14 -04:00
2017-01-11 16:47:13 -07:00