es启动无报错killed，内存未看出异常

es 7.4.2
centerOS7 
JDK1.8[esroot@iZ0xi7vg8f3ifef8l23iccZ bin]$ ./elasticsearch
future versions of Elasticsearch will require Java 11; your Java version from [/usr/java/jdk1.8.0_231-amd64/jre] does not meet this requirement
[2020-03-02T13:50:48,225][INFO ][o.e.e.NodeEnvironment    ] [node-1] using [1] data paths, mounts [[/ (rootfs)]], net usable_space [37.7gb], net total_space [49gb], types [rootfs]
[2020-03-02T13:50:48,227][INFO ][o.e.e.NodeEnvironment    ] [node-1] heap size [494.9mb], compressed ordinary object pointers [true]
[2020-03-02T13:50:48,229][INFO ][o.e.n.Node               ] [node-1] node name [node-1], node ID [Ve4GT8_wQOeEeHbvrXwdCw], cluster name [fond-application]
[2020-03-02T13:50:48,230][INFO ][o.e.n.Node               ] [node-1] version[7.4.2], pid[28362], build[default/tar/2f90bbf7b93631e52bafb59b3b049cb44ec25e96/2019-10-28T20:40:44.881551Z], OS[Linux/3.10.0-1062.1.1.el7.x86_64/amd64], JVM[Oracle Corporation/Java HotSpot(TM) 64-Bit Server VM/1.8.0_231/25.231-b11]
[2020-03-02T13:50:48,230][INFO ][o.e.n.Node               ] [node-1] JVM home [/usr/java/jdk1.8.0_231-amd64/jre]
[2020-03-02T13:50:48,231][INFO ][o.e.n.Node               ] [node-1] JVM arguments [-Xms512m, -Xmx512m, -XX:+UseConcMarkSweepGC, -XX:CMSInitiatingOccupancyFraction=75, -XX:+UseCMSInitiatingOccupancyOnly, -Des.networkaddress.cache.ttl=60, -Des.networkaddress.cache.negative.ttl=10, -XX:+AlwaysPreTouch, -Xss1m, -Djava.awt.headless=true, -Dfile.encoding=UTF-8, -Djna.nosys=true, -XX:-OmitStackTraceInFastThrow, -Dio.netty.noUnsafe=true, -Dio.netty.noKeySetOptimization=true, -Dio.netty.recycler.maxCapacityPerThread=0, -Dio.netty.allocator.numDirectArenas=0, -Dlog4j.shutdownHookEnabled=false, -Dlog4j2.disable.jmx=true, -Djava.io.tmpdir=/tmp/elasticsearch-466000506352476416, -XX:+HeapDumpOnOutOfMemoryError, -XX:HeapDumpPath=data, -XX:ErrorFile=logs/hs_err_pid%p.log, -XX:+PrintGCDetails, -XX:+PrintGCDateStamps, -XX:+PrintTenuringDistribution, -XX:+PrintGCApplicationStoppedTime, -Xloggc:logs/gc.log, -XX:+UseGCLogFileRotation, -XX:NumberOfGCLogFiles=32, -XX:GCLogFileSize=64m, -Dio.netty.allocator.type=unpooled, -XX:MaxDirectMemorySize=268435456, -Des.path.home=/elasticsearch-7.4.2, -Des.path.conf=/elasticsearch-7.4.2/config, -Des.distribution.flavor=default, -Des.distribution.type=tar, -Des.bundled_jdk=true]
[2020-03-02T13:50:50,520][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [aggs-matrix-stats]
[2020-03-02T13:50:50,520][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [analysis-common]
[2020-03-02T13:50:50,520][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [data-frame]
[2020-03-02T13:50:50,520][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [flattened]
[2020-03-02T13:50:50,521][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [frozen-indices]
[2020-03-02T13:50:50,521][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [ingest-common]
[2020-03-02T13:50:50,521][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [ingest-geoip]
[2020-03-02T13:50:50,521][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [ingest-user-agent]
[2020-03-02T13:50:50,522][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [lang-expression]
[2020-03-02T13:50:50,522][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [lang-mustache]
[2020-03-02T13:50:50,522][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [lang-painless]
[2020-03-02T13:50:50,522][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [mapper-extras]
[2020-03-02T13:50:50,523][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [parent-join]
[2020-03-02T13:50:50,523][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [percolator]
[2020-03-02T13:50:50,523][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [rank-eval]
[2020-03-02T13:50:50,523][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [reindex]
[2020-03-02T13:50:50,524][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [repository-url]
[2020-03-02T13:50:50,524][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [search-business-rules]
[2020-03-02T13:50:50,524][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [spatial]
[2020-03-02T13:50:50,524][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [transport-netty4]
[2020-03-02T13:50:50,525][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [vectors]
[2020-03-02T13:50:50,525][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [x-pack-analytics]
[2020-03-02T13:50:50,525][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [x-pack-ccr]
[2020-03-02T13:50:50,525][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [x-pack-core]
[2020-03-02T13:50:50,526][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [x-pack-deprecation]
[2020-03-02T13:50:50,526][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [x-pack-graph]
[2020-03-02T13:50:50,526][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [x-pack-ilm]
[2020-03-02T13:50:50,526][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [x-pack-logstash]
[2020-03-02T13:50:50,527][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [x-pack-ml]
[2020-03-02T13:50:50,527][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [x-pack-monitoring]
[2020-03-02T13:50:50,527][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [x-pack-rollup]
[2020-03-02T13:50:50,527][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [x-pack-security]
[2020-03-02T13:50:50,528][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [x-pack-sql]
[2020-03-02T13:50:50,528][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [x-pack-voting-only-node]
[2020-03-02T13:50:50,528][INFO ][o.e.p.PluginsService     ] [node-1] loaded module [x-pack-watcher]
[2020-03-02T13:50:50,529][INFO ][o.e.p.PluginsService     ] [node-1] no plugins loaded
[2020-03-02T13:50:54,831][INFO ][o.e.x.s.a.s.FileRolesStore] [node-1] parsed [0] roles from file [/elasticsearch-7.4.2/config/roles.yml]
[2020-03-02T13:50:55,504][INFO ][o.e.x.m.p.l.CppLogMessageHandler] [node-1] [controller/28455] [Main.cc@110] controller (64 bit): Version 7.4.2 (Build 473f61b8a5238b) Copyright (c) 2019 Elasticsearch BV
[2020-03-02T13:50:56,131][DEBUG][o.e.a.ActionModule       ] [node-1] Using REST wrapper from plugin org.elasticsearch.xpack.security.Security
[2020-03-02T13:50:56,511][INFO ][o.e.d.DiscoveryModule    ] [node-1] using discovery type [zen] and seed hosts providers [settings]
[2020-03-02T13:50:57,416][INFO ][o.e.n.Node               ] [node-1] initialized
[2020-03-02T13:50:57,416][INFO ][o.e.n.Node               ] [node-1] starting ...
[2020-03-02T13:50:57,544][INFO ][o.e.t.TransportService   ] [node-1] publish_address {172.22.126.14:9300}, bound_addresses {0.0.0.0:9300}
[2020-03-02T13:50:57,553][INFO ][o.e.b.BootstrapChecks    ] [node-1] bound or publishing to a non-loopback address, enforcing bootstrap checks
[2020-03-02T13:50:57,595][INFO ][o.e.c.c.Coordinator      ] [node-1] cluster UUID [8cMNkzwrSLCUDmW-nG9JBQ]
[2020-03-02T13:50:57,732][INFO ][o.e.c.s.MasterService    ] [node-1] elected-as-master ([1] nodes joined)[{node-1}{Ve4GT8_wQOeEeHbvrXwdCw}{NPn1SfnvQMSGOSZAJcjQXg}{172.22.126.14}{172.22.126.14:9300}{dilm}{ml.machine_memory=8200929280, xpack.installed=true, ml.max_open_jobs=20} elect leader, _BECOME_MASTER_TASK_, _FINISH_ELECTION_], term: 4, version: 24, reason: master node changed {previous , current [{node-1}{Ve4GT8_wQOeEeHbvrXwdCw}{NPn1SfnvQMSGOSZAJcjQXg}{172.22.126.14}{172.22.126.14:9300}{dilm}{ml.machine_memory=8200929280, xpack.installed=true, ml.max_open_jobs=20}]}
[2020-03-02T13:50:57,842][INFO ][o.e.c.s.ClusterApplierService] [node-1] master node changed {previous , current [{node-1}{Ve4GT8_wQOeEeHbvrXwdCw}{NPn1SfnvQMSGOSZAJcjQXg}{172.22.126.14}{172.22.126.14:9300}{dilm}{ml.machine_memory=8200929280, xpack.installed=true, ml.max_open_jobs=20}]}, term: 4, version: 24, reason: Publication{term=4, version=24}
[2020-03-02T13:50:57,904][INFO ][o.e.h.AbstractHttpServerTransport] [node-1] publish_address {172.22.126.14:9200}, bound_addresses {0.0.0.0:9200}
[2020-03-02T13:50:57,905][INFO ][o.e.n.Node               ] [node-1] started
[2020-03-02T13:50:58,203][INFO ][o.e.l.LicenseService     ] [node-1] license [9687fee9-a231-4b49-905f-26c6c8c6e210] mode [basic] - valid
[2020-03-02T13:50:58,204][INFO ][o.e.x.s.s.SecurityStatusChangeListener] [node-1] Active license is now [BASIC]; Security is disabled
[2020-03-02T13:50:58,216][INFO ][o.e.g.GatewayService     ] [node-1] recovered [0] indices into cluster_state
Killed
[esroot@iZ0xi7vg8f3ifef8l23iccZ bin]$ free
              total        used        free      shared  buff/cache   available
Mem:        8008720     5226692     1485168         652     1296860     2482200
Swap:             0           0           0