logstash启动后，看日志一直重启，pid一直在变

"}
[2019-11-14T15:18:02,022][INFO ][logstash.javapipeline    ][main] Pipeline started {"pipeline.id"=>"main"}
[2019-11-14T15:18:02,110][INFO ][logstash.agent           ] Pipelines running {:count=>1, :running_pipelines=>[:main], :non_running_pipelines=>[]}
[2019-11-14T15:18:02,604][INFO ][logstash.agent           ] Successfully started Logstash API endpoint {:port=>9600}
[2019-11-14T15:18:03,820][INFO ][logstash.runner          ] Logstash shut down.
[2019-11-14T15:18:30,160][INFO ][logstash.runner          ] Starting Logstash {"logstash.version"=>"7.4.2"}
[2019-11-14T15:18:32,675][INFO ][org.reflections.Reflections] Reflections took 53 ms to scan 1 urls, producing 20 keys and 40 values 
[2019-11-14T15:18:34,175][WARN ][org.logstash.instrument.metrics.gauge.LazyDelegatingGauge][main] A gauge metric of an unknown type (org.jruby.RubyArray) has been create for key: cluster_uuids. This may result in invalid serialization.  It is recommended to log an issue to the responsible developer/development team.
[2019-11-14T15:18:34,180][INFO ][logstash.javapipeline    ][main] Starting pipeline {:pipeline_id=>"main", "pipeline.workers"=>8, "pipeline.batch.size"=>125, "pipeline.batch.delay"=>50, "pipeline.max_inflight"=>1000, :thread=>"#<Thread:0x7bdc7d1e run>"}
[2019-11-14T15:18:34,215][INFO ][logstash.javapipeline    ][main] Pipeline started {"pipeline.id"=>"main"}
[2019-11-14T15:18:34,326][INFO ][logstash.agent           ] Pipelines running {:count=>1, :running_pipelines=>[:main], :non_running_pipelines=>[]}
[2019-11-14T15:18:34,853][INFO ][logstash.agent           ] Successfully started Logstash API endpoint {:port=>9600}
[2019-11-14T15:18:36,516][INFO ][logstash.runner          ] Logstash shut down.