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