Unable to configure Index Lifecycle Management (ILM) with Logstash Elasticsearch output

[DougR]

I'm simply trying to get ILM to work at the moment with Logstash, Elasticsearch, and Filebeat. Or any other beat.

This is my elasticsearch output block:

output {
    elasticsearch {
        hosts => ["localhost:9200"]
        manage_template => false
        ilm_enabled => true
        ilm_rollover_alias => "filebeat-rollover"
        ilm_pattern => "filebeat-7.4.2-{now/d}-000001"
        ilm_policy => "ilm-default-policy"
    }
}

The policy ilm-default-policy does exist.

This is what I get in my Logstash logs:

[2019-11-19T09:36:03,208][INFO ][logstash.runner          ] Starting Logstash {"logstash.version"=>"7.1.1"}
[2019-11-19T09:36:09,054][INFO ][logstash.outputs.elasticsearch] Elasticsearch pool URLs updated {:changes=>{:removed=>[], :added=>[http://localhost:9200/]}}
[2019-11-19T09:36:09,363][WARN ][logstash.outputs.elasticsearch] Restored connection to ES instance {:url=>"http://localhost:9200/"}
[2019-11-19T09:36:09,409][INFO ][logstash.outputs.elasticsearch] ES Output version determined {:es_version=>7}
[2019-11-19T09:36:09,412][WARN ][logstash.outputs.elasticsearch] Detected a 6.x and above cluster: the `type` event field won't be used to determine the document _type {:es_version=>7}
[2019-11-19T09:36:09,435][INFO ][logstash.outputs.elasticsearch] New Elasticsearch output {:class=>"LogStash::Outputs::ElasticSearch", :hosts=>["//localhost:9200"]}
[2019-11-19T09:36:09,665][FATAL][logstash.runner          ] An unexpected error occurred! {:error=>#<LogStash::Outputs::ElasticSearch::HttpClient::Pool::BadResponseCodeError: LogStash::Outputs::ElasticSearch::HttpClient::Pool::BadResponseCodeError>, :backtrace=>["/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-elasticsearch-10.1.0-java/lib/logstash/outputs/elasticsearch/http_client/manticore_adapter.rb:80:in `perform_request'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-elasticsearch-10.1.0-java/lib/logstash/outputs/elasticsearch/http_client/pool.rb:291:in `perform_request_to_url'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-elasticsearch-10.1.0-java/lib/logstash/outputs/elasticsearch/http_client/pool.rb:278:in `block in perform_request'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-elasticsearch-10.1.0-java/lib/logstash/outputs/elasticsearch/http_client/pool.rb:373:in `with_connection'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-elasticsearch-10.1.0-java/lib/logstash/outputs/elasticsearch/http_client/pool.rb:277:in `perform_request'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-elasticsearch-10.1.0-java/lib/logstash/outputs/elasticsearch/http_client/pool.rb:285:in `block in Pool'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-elasticsearch-10.1.0-java/lib/logstash/outputs/elasticsearch/http_client.rb:341:in `exists?'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-elasticsearch-10.1.0-java/lib/logstash/outputs/elasticsearch/http_client.rb:359:in `rollover_alias_exists?'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-elasticsearch-10.1.0-java/lib/logstash/outputs/elasticsearch/ilm.rb:91:in `maybe_create_rollover_alias'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-elasticsearch-10.1.0-java/lib/logstash/outputs/elasticsearch/ilm.rb:10:in `setup_ilm'", "/usr/share/logstash/vendor/bundle/jruby/2.5.0/gems/logstash-output-elasticsearch-10.1.0-java/lib/logstash/outputs/elasticsearch/common.rb:52:in `block in setup_after_successful_connection'"]}
[2019-11-19T09:36:09,696][INFO ][logstash.javapipeline    ] Starting pipeline {:pipeline_id=>"main", "pipeline.workers"=>8, "pipeline.batch.size"=>125, "pipeline.batch.delay"=>50, "pipeline.max_inflight"=>1000, :thread=>"#<Thread:0xffca1e9 run>"}
[2019-11-19T09:36:09,754][ERROR][org.logstash.Logstash    ] java.lang.IllegalStateException: Logstash stopped processing because of an error: (SystemExit) exit