Logstash 8.x recent versions require plugin 6.0 to work

[lucabelluccini]

Logstash information:

LS 8.17.4
Plugin http poller input 5.6.0 bundled

Description of the problem including expected versus actual behavior:

Running

input {
  http_poller {
    id => "something"
    urls => {
      logstash_stats => {
        method => get
        url => "http://localhost:9600/_node/stats/pipelines"
      }
    }
    request_timeout => 10
    schedule => { every => "30s" }
    codec => "json_lines"
  }
}

Fails with:

[2025-03-26T21:11:01,563][ERROR][logstash.javapipeline    ][main] Pipeline error {:pipeline_id=>"main", :exception=>#<NoMethodError: undefined method `match' for nil:NilClass
Did you mean?  catch>,
:backtrace=>[
"/vendor/bundle/jruby/3.1.0/gems/logstash-input-http_poller-5.6.0/lib/logstash/inputs/http_poller.rb:158:in `validate_request!'",
"/vendor/bundle/jruby/3.1.0/gems/logstash-input-http_poller-5.6.0/lib/logstash/inputs/http_poller.rb:150:in `normalize_request'",

Workaround

Upgrade the HTTP Poller input plugin to 6.0.0, forcing it with --level=major

Fix

This has been fixed in #148 but this should also be backported to 5.x so that Logstash plugins can be upgraded without the --level=major.

We should probably add a known issues to the release notes of all the LS versions affected?

[robbavey]

HTTP Poller input 5.6.1 released, which includes this fix.

Release notes amended to include known issue for 8.17.4