pipeline error on https: host responding with plain-text

[kares]

Logstash information: 7.10.2

(ES output plugin Version: 10.7.3)

As the plugin starts, if pings each entry from hosts.
If the connection fails with a "resolution/timeout/socket" error the host is marked as unreachable (HostUnreachableError).

No all exceptions will "properly" resolve to unreachable e.g. a https:// hosts returning non TLS response will end up mapping a
javax.net.ssl.SSLException: Unsupported or unrecognized SSL message to a Manticore::UnknownException.

The plugin should consider improving it's behavior and flag SSL (some?) errors as "unreachable".

[kares]

specifically the Unsupported or unrecognized SSL message could also happen if ES isn't secured and runs plain http://
... while LS is configured to connect using a https:// url.