ERROR: Something went wrong when installing ./logstash-filter-java_filter_example-1.0.2.gem, message: undefined method `headers' for #<Net::HTTPFound 302 Found readbody=true>
Weird, same here just now. Did you manage to work around this issue?
Just to give more context, was able to add a non-custom plugin earlier after a few tries (elapsed plugin). Was having the same HTTPFound 302 error before the plugin was successfully installed. However, upon installing a custom local java filter plugin, using OP's same command, I can't install it anymore with the same HTTPFound 302 error.
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