wu-sheng closed pull request #1052: Collector 5.0.0-alpha version upgrade FAQ.
URL: https://github.com/apache/incubator-skywalking/pull/1052
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diff --git a/docs/README.md b/docs/README.md
index a3bb22fbe..fefc0a63a 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -38,4 +38,5 @@
* [Why only traces in UI?](cn/FAQ/Why-have-traces-no-others.md)
* [Too many GRPC logs in the console](cn/FAQ/Too-many-gRPC-logs.md)
* [The trace doesn't continue in kafka consumer
side](en/FAQ/kafka-plugin.md)
-
+ * [Agent or collector version upgrade](en/FAQ/Upgrade.md)
+
\ No newline at end of file
diff --git a/docs/en/FAQ/Upgrade.md b/docs/en/FAQ/Upgrade.md
new file mode 100644
index 000000000..2f18bb8b4
--- /dev/null
+++ b/docs/en/FAQ/Upgrade.md
@@ -0,0 +1,12 @@
+# Upgrade FAQs
+## Version 3.x -> 5.0.0-alpha
+### Collector
+- **Problem**
+There is no information showing in the UI.
+
+- **Cause**
+In upgrate from 3.2.6 to 5.0.0, Elasticsearch indexes aren't recreated,
because not indexes exist, but aren't compatible with 5.0.0-alpha.
+When service name registered, the es will create this column by default type
string, which is wrong.
+
+- **Solution**
+Clean the data folder in ElasticSearch and restart ElasticSearch, collector
and your under monitoring application.
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