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Docs: Document that the fielddata loading defaults to eager on the _parent field.

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Closes #9804
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Martijn van Groningen 2015-02-22 23:15:37 +01:00
parent 298f753bf2
commit daefb4c673
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docs/reference/mapping/fields/parent-field.asciidoc
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@ -19,3 +19,9 @@ should be:
The mapping is automatically stored and indexed (meaning it can be
searched on using the `_parent` field notation).
==== Field data loading
Contrary to other fields the fielddata loading is not `lazy`, but `eager`. The reason for this is that when this
field has been enabled it is going to be used in parent/child queries, which heavily relies on field data to perform
efficiently. This can already be observed during indexing after refresh either automatically or manually has been executed.