java.sql.SQLException: This version of the JDBC driver is only compatible with Elasticsearch version vUnknown [Unknown], attempting to connect to a server version 7.5.1

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java.sql.SQLException: This version of the JDBC driver is only compatible with Elasticsearch version vUnknown [Unknown], attempting to connect to a server version 7.5.1

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It would help if you elaborated a bit on the issue. What version of the JDBC driver are you using? Whish version is the cluster running? What is the output of the info API?

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Indeed, more details would be helpful to know for certain, but the error message looks like an instance of this issue, which was fixed in 7.7.1.

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