kezhenxu94 commented on a change in pull request #6916:
URL: https://github.com/apache/skywalking/pull/6916#discussion_r628765445



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File path: docs/en/setup/backend/backend-storage.md
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@@ -31,14 +32,20 @@ storage:
     user: sa
 ```
 
+## OpenSearch
+
+OpenSearch storage shares the same configurations as ElasticSearch 7.
+In order to activate ElasticSearch 7 as storage, set storage provider to 
**elasticsearch7**.
+Please download the `apache-skywalking-bin-es7.tar.gz` if you want to use 
OpenSearch as storage.
+
 ## ElasticSearch
 - In order to activate ElasticSearch 6 as storage, set storage provider to 
**elasticsearch**
 - In order to activate ElasticSearch 7 as storage, set storage provider to 
**elasticsearch7**
 
 **Required ElasticSearch 6.3.2 or higher. HTTP RestHighLevelClient is used to 
connect server.**
 

Review comment:
       I just don’t see the point to add the notice to the users because the 
clients jar we are using now can be safely used no matter what server version 
the users use. And if the users want to download more recent versions (SSPL), 
that’s Elastic’s or / and users’ duty to check their license issue. The reason 
why MySQL jar needs a notice is that IMO it needs users action explicitly 
otherwise our project won’t work when using MYSQL as storage. 




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