Upgrading Elastic Search from 5.6.3 to 6.8.2


I'm upgrading my ES node from 5.6.3 to 6.8.2 on Linux CentOS 7.8.
After installing ES, it fails to start with this error :
Exception in thread "main" java.lang.NoSuchMethodError: org.elasticsearch.common.xcontent.XContentBuilder.getOutputStream()Ljava/io/OutputStream

Anybody knows why ?

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