Version 3.x -> 5.0.0-alpha Upgrade FAQs
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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.
Clean the data folder in ElasticSearch and restart ElasticSearch, collector and your application under monitoring.