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[8.18] [8.19][DOCS] Highlight the subscription requirement for synthetic _source (#133444) #133470

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Aug 25, 2025
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[8.18] [8.19][DOCS] Highlight the subscription requirement for synthetic _source (#133444) #133470

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4 changes: 3 additions & 1 deletion docs/reference/mapping/fields/synthetic-source.asciidoc
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[[synthetic-source]]
==== Synthetic `_source`

NOTE: This feature requires a https://www.elastic.co/subscriptions[subscription].

Though very handy to have around, the source field takes up a significant amount
of space on disk. Instead of storing source documents on disk exactly as you
send them, Elasticsearch can reconstruct source content on the fly upon retrieval.
To enable this https://www.elastic.co/subscriptions[subscription] feature, use the value `synthetic` for the index setting `index.mapping.source.mode`:
To enable this feature, use the value `synthetic` for the index setting `index.mapping.source.mode`:

[source,console,id=enable-synthetic-source-example]
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