Update backend-storage docs (#1861)

c36ffb01 · Lemon · GitHub · 7cd805a8 · c36ffb01
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docs/en/setup/backend/backend-storage.md docs/en/setup/backend/backend-storage.md +2 -0

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--- a/docs/en/setup/backend/backend-storage.md
+++ b/docs/en/setup/backend/backend-storage.md
@@ -22,6 +22,8 @@ storage:
 ## ElasticSearch 6
 Active ElasticSearch 6 as storage, set storage provider to **elasticsearch**.

+> Required ElasticSearch 6.3.0 or higher.
+
 Setting fragment example
 ```yaml
 storage: