## Version 3.x -> 5.0.0-alpha Upgrade FAQs | |
### Collector | |
### Problem | |
There is no information showing in the UI. | |
### Cause | |
In the upgrade from version 3.2.6 to 5.0.0, the existing Elasticsearch indexes are kept, but aren't compatible with 5.0.0-alpha. | |
When service name is registered, ElasticSearch will create this column by default type string, which will lead to an error. | |
### Solution | |
Clean the data folder in ElasticSearch and restart ElasticSearch, collector and your application under monitoring. |