wu-sheng commented on a change in pull request #7634:
URL: https://github.com/apache/skywalking/pull/7634#discussion_r702549697



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File path: docs/en/setup/backend/configuration-vocabulary.md
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@@ -79,12 +79,13 @@ core|default|role|Option values: 
`Mixed/Receiver/Aggregator`. **Receiver** mode
 | - | - | password | Nacos Auth password. | SW_CLUSTER_NACOS_PASSWORD | - |
 | - | - | accessKey | Nacos Auth accessKey. | SW_CLUSTER_NACOS_ACCESSKEY | - |
 | - | - | secretKey | Nacos Auth secretKey.  | SW_CLUSTER_NACOS_SECRETKEY | - |
-| storage|elasticsearch| - | ElasticSearch 6 storage implementation. | - | - |
+| storage|elasticsearch| - | ElasticSearch (and OpenSearch) storage 
implementation. | - | - |
 | - | - | nameSpace | Prefix of indexes created and used by SkyWalking. | 
SW_NAMESPACE | - |
 | - | - | clusterNodes | ElasticSearch cluster nodes for client connection.| 
SW_STORAGE_ES_CLUSTER_NODES |localhost|
 | - | - | protocol | HTTP or HTTPs. | SW_STORAGE_ES_HTTP_PROTOCOL | HTTP|
 | - | - | connectTimeout | Connect timeout of ElasticSearch client (in 
milliseconds). | SW_STORAGE_ES_CONNECT_TIMEOUT | 500|
 | - | - | socketTimeout | Socket timeout of ElasticSearch client (in 
milliseconds). | SW_STORAGE_ES_SOCKET_TIMEOUT | 30000|
+| - | - | numHttpClientThread | The number of threads for the underlying HTTP 
client to perform socket I/O. If the value is <= 0, the number of available 
processors will be used. | SW_STORAGE_ES_NUM_HTTP_CLIENT_THREAD | 0 |

Review comment:
       Just one check, all metrics/log/traces persistent are according to bulk 
thread today, right? So, it always uses 2 threads in default. Then others are 
for query if there are over 2 cores.




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