我在EC2上使用Elasticsearch时遇到了一个问题，我从同一个AMI启动了几个新实例，并且非常偶尔(如<(1%的时间)，Elasticsearch服务将在启动后不久停止。我已经查看了日志文件，但我不太清楚服务为什么会停止。我是否遗漏了什么线索，或者当发生这种情况时，我是否应该在其他地方查找日志?
[2020-07-28T18:17:44,251][INFO ][o.e.c.c.ClusterBootstrapService] [ip-10-0-0-68] no discovery configuration found, will perform best-effort cluster bootstrapping after [3s] unless existing master is discovered
[2020-07-28T18:17:44,375][INFO ][o.e.c.s.MasterService ] [ip-10-0-0-68] elected-as-master ([1] nodes joined)[{ip-10-0-0-68}{C1lEYCg6RUWry4avn4isxw}{IjXE3KNOQO2UeZyrX2o3FA}{127.0.0.1}{127.0.0.1:9300}{dilm}{ml.machine_memory=32601837568, xpack.installed=true, ml.max_open_jobs=20} elect leader, _BECOME_MASTER_TASK_, _FINISH_ELECTION_], term: 4, version: 26, delta: master node changed {previous [], current [{ip-10-0-0-68}{C1lEYCg6RUWry4avn4isxw}{IjXE3KNOQO2UeZyrX2o3FA}{127.0.0.1}{127.0.0.1:9300}{dilm}{ml.machine_memory=32601837568, xpack.installed=true, ml.max_open_jobs=20}]}
[2020-07-28T18:17:44,416][INFO ][o.e.c.s.ClusterApplierService] [ip-10-0-0-68] master node changed {previous [], current [{ip-10-0-0-68}{C1lEYCg6RUWry4avn4isxw}{IjXE3KNOQO2UeZyrX2o3FA}{127.0.0.1}{127.0.0.1:9300}{dilm}{ml.machine_memory=32601837568, xpack.installed=true, ml.max_open_jobs=20}]}, term: 4, version: 26, reason: Publication{term=4, version=26}
[2020-07-28T18:17:44,446][INFO ][o.e.h.AbstractHttpServerTransport] [ip-10-0-0-68] publish_address {127.0.0.1:9200}, bound_addresses {[::1]:9200}, {127.0.0.1:9200}
[2020-07-28T18:17:44,447][INFO ][o.e.n.Node ] [ip-10-0-0-68] started
[2020-07-28T18:17:44,595][INFO ][o.e.l.LicenseService ] [ip-10-0-0-68] license [a9a29e21-5167-497e-9e49-ccc785ea2d47] mode [basic] - valid
[2020-07-28T18:17:44,596][INFO ][o.e.x.s.s.SecurityStatusChangeListener] [ip-10-0-0-68] Active license is now [BASIC]; Security is disabled
[2020-07-28T18:17:44,602][INFO ][o.e.g.GatewayService ] [ip-10-0-0-68] recovered [0] indices into cluster_state
[2020-07-28T18:18:29,947][INFO ][o.e.n.Node ] [ip-10-0-0-68] stopping ...
[2020-07-28T18:18:29,962][INFO ][o.e.x.w.WatcherService ] [ip-10-0-0-68] stopping watch service, reason [shutdown initiated]
[2020-07-28T18:18:29,963][INFO ][o.e.x.w.WatcherLifeCycleService] [ip-10-0-0-68] watcher has stopped and shutdown
[2020-07-28T18:18:30,014][INFO ][o.e.x.m.p.l.CppLogMessageHandler] [ip-10-0-0-68] [controller/2184] [Main.cc@150] Ml controller exiting
[2020-07-28T18:18:30,015][INFO ][o.e.x.m.p.NativeController] [ip-10-0-0-68] Native controller process has stopped - no new native processes can be started
[2020-07-28T18:18:30,024][INFO ][o.e.n.Node ] [ip-10-0-0-68] stopped
[2020-07-28T18:18:30,024][INFO ][o.e.n.Node ] [ip-10-0-0-68] closing ...
[2020-07-28T18:18:30,032][INFO ][o.e.n.Node ] [ip-10-0-0-68] closed
[2020-07-28T18:18:29,947][INFO ][o.e.n.Node ] [ip-10-0-0-68] stopping ...
此日志线表示Elasticsearch在从外部源接收到关机信号(通常是SIGTERM)后正常关闭。外部源是什么是不可能的，这取决于你的系统。它可以是systemd如果你是这样开始Elasticsearch的。如果是这样，希望它的日志告诉你为什么它发送关闭信号。