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Logstash don't start with 7.9.0-SNAPSHOT and default values

See original GitHub issue

Following 7.x branch bump to 7.9.0-SNAPSHOT artifacts in #661, Logstash chart doesn’t start anymore with the default values:

[2020-06-12T11:46:07,182][ERROR][logstash.monitoringextension.pipelineregisterhook] Failed to set up the metrics pipeline {:message=>"With the default xpack.monitoring.elasticsearch.username, xpack.monitoring.elasticsearch.password must be set", :backtrace=>["/usr/share/logstash/x-pack/lib/helpers/elasticsearch_options.rb:207:in `validate_authentication!'", "/usr/share/logstash/x-pack/lib/helpers/elasticsearch_options.rb:50:in `es_options_from_settings'", "/usr/share/logstash/x-pack/lib/helpers/elasticsearch_options.rb:41:in `es_options_from_settings_or_modules'", "/usr/share/logstash/x-pack/lib/monitoring/monitoring.rb:201:in `generate_pipeline_config'", "/usr/share/logstash/x-pack/lib/monitoring/monitoring.rb:180:in `setup_metrics_pipeline'", "/usr/share/logstash/x-pack/lib/monitoring/monitoring.rb:142:in `after_agent'", "org/logstash/execution/EventDispatcherExt.java:91:in `execute'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:388:in `execute'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/clamp-0.6.5/lib/clamp/command.rb:67:in `run'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:268:in `run'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/clamp-0.6.5/lib/clamp/command.rb:132:in `run'", "/usr/share/logstash/lib/bootstrap/environment.rb:88:in `<main>'"]}
[2020-06-12T11:46:07,185][FATAL][logstash.runner          ] An unexpected error occurred! {:error=>#<ArgumentError: With the default xpack.monitoring.elasticsearch.username, xpack.monitoring.elasticsearch.password must be set>, :backtrace=>["/usr/share/logstash/x-pack/lib/helpers/elasticsearch_options.rb:207:in `validate_authentication!'", "/usr/share/logstash/x-pack/lib/helpers/elasticsearch_options.rb:50:in `es_options_from_settings'", "/usr/share/logstash/x-pack/lib/helpers/elasticsearch_options.rb:41:in `es_options_from_settings_or_modules'", "/usr/share/logstash/x-pack/lib/monitoring/monitoring.rb:201:in `generate_pipeline_config'", "/usr/share/logstash/x-pack/lib/monitoring/monitoring.rb:180:in `setup_metrics_pipeline'", "/usr/share/logstash/x-pack/lib/monitoring/monitoring.rb:142:in `after_agent'", "org/logstash/execution/EventDispatcherExt.java:91:in `execute'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:388:in `execute'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/clamp-0.6.5/lib/clamp/command.rb:67:in `run'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:268:in `run'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/clamp-0.6.5/lib/clamp/command.rb:132:in `run'", "/usr/share/logstash/lib/bootstrap/environment.rb:88:in `<main>'"]}
[2020-06-12T11:46:07,247][ERROR][org.logstash.Logstash    ] java.lang.IllegalStateException: Logstash stopped processing because of an error: (SystemExit) exit

It seems that Logstash 7.9 now requires an Elasticsearch user/password when xpack.monitoring.enabled is enabled (enabled by default in basic Logstash Docker image) while Logstash < 7.9 was fine with an Elasticsearch with no authentication.