[skywalking] 01/01: Update backend-storage.md

[wu...@apache.org]

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wusheng pushed a commit to branch wu-sheng-patch-1
in repository https://gitbox.apache.org/repos/asf/skywalking.git

commit 74889347ddd9fca5617819fc82b1dd80f50fb806
Author: 吴晟 Wu Sheng <wu...@foxmail.com>
AuthorDate: Thu Jun 20 12:02:38 2019 +0800

    Update backend-storage.md
---
 docs/en/setup/backend/backend-storage.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/docs/en/setup/backend/backend-storage.md b/docs/en/setup/backend/backend-storage.md
index 415e3a9..3d897d1 100644
--- a/docs/en/setup/backend/backend-storage.md
+++ b/docs/en/setup/backend/backend-storage.md
@@ -76,6 +76,8 @@ storage:
     concurrentRequests: ${SW_STORAGE_ES_CONCURRENT_REQUESTS:2} # the number of concurrent requests
 ```
 
+Read the [ElasticSearch storage FAQ](../../FAQ/ES-Server-FAQ.md) if you are new to ElasticSearch. And recommend read more about these configuration from ElasticSearch official document. This effects the performance of ElasticSearch very much.
+
 ### ElasticSearch 6 with Jaeger trace extension
 This implementation shares most of `elasticsearch`, just extend to support zipkin span storage.
 It has all same configs.