[skywalking] branch master updated: Update backend-storage.md (#2950)

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The following commit(s) were added to refs/heads/master by this push:
     new 0922548  Update backend-storage.md (#2950)
0922548 is described below

commit 09225480693c83ff60da6007a9c7512a4cdd4097
Author: 吴晟 Wu Sheng <wu...@foxmail.com>
AuthorDate: Thu Jun 27 00:14:37 2019 +0800

    Update backend-storage.md (#2950)
---
 docs/en/setup/backend/backend-storage.md | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/docs/en/setup/backend/backend-storage.md b/docs/en/setup/backend/backend-storage.md
index 3d897d1..da0a78c 100644
--- a/docs/en/setup/backend/backend-storage.md
+++ b/docs/en/setup/backend/backend-storage.md
@@ -53,6 +53,9 @@ storage:
     concurrentRequests: ${SW_STORAGE_ES_CONCURRENT_REQUESTS:2} # the number of concurrent requests
 ```
 
+### Data TTL
+TTL in ElasticSearch overrides the settings of core, read [ElasticSearch section in TTL document](ttl.md#elasticsearch-6-storage-ttl)
+
 ### ElasticSearch 6 with Zipkin trace extension
 This implementation shares most of `elasticsearch`, just extend to support zipkin span storage.
 It has all same configs.