NIFI-13649 Ensure cluster node API address is reachable before markin…

[bbende]

…g CONNECTED

Summary

NIFI-13649

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  • JDK 21

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[exceptionfactory]

Thanks for introducing the improvements here @bbende. I noted a concern regarding the isReachable() method behavior, and I think an alternative approach using a basic Socket connection would be more reliable across platforms.

[bbende]

Thanks @exceptionfactory , pushed an update to address the feedback

[exceptionfactory]

Thanks for making the adjustments @bbende, the latest version looks good! +1 merging