What is my error?

Sorry, It is my second notebook for testing the server.
So I couldn't copy the scripts.

please copy text instead of taking photos, as those are much harder to read.

there is no error in the logs. Why do you think so?

There is 3 error message. log scripts below.

elasticsearch.log

[2019-08-14T09:27:55,158][INFO ][o.e.e.NodeEnvironment ] [localhost.localdomain] using [1] data paths, mounts [[/ (rootfs)]], net usable_space [59.1gb], net total_space [61.6gb], types [rootfs]
[2019-08-14T09:27:55,434][INFO ][o.e.e.NodeEnvironment ] [localhost.localdomain] heap size [1007.3mb], compressed ordinary object pointers [true]
[2019-08-14T09:27:55,541][INFO ][o.e.n.Node ] [localhost.localdomain] node name [localhost.localdomain], node ID [7Ra_zQ8HSOuCnXfRz-4jJw], cluster name [elasticsearch]
[2019-08-14T09:27:55,574][INFO ][o.e.n.Node ] [localhost.localdomain] version[7.2.0], pid[980], build[default/rpm/508c38a/2019-06-20T15:54:18.811730Z], OS[Linux/3.10.0-957.21.3.el7.x86_64/amd64], JVM[Oracle Corporation/OpenJDK 64-Bit Server VM/12.0.1/12.0.1+12]
[2019-08-14T09:27:55,576][INFO ][o.e.n.Node ] [localhost.localdomain] JVM home [/usr/share/elasticsearch/jdk]
[2019-08-14T09:27:55,577][INFO ][o.e.n.Node ] [localhost.localdomain] JVM arguments [-Xms1g, -Xmx1g, -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, -Dlog4j.shutdownHookEnabled=false, -Dlog4j2.disable.jmx=true, -Djava.io.tmpdir=/tmp/elasticsearch-17378481985232699567,  **-XX:+HeapDumpOnOutOfMemoryError** , -XX:HeapDumpPath=/var/lib/elasticsearch,  **-XX:ErrorFile=/var/log/elasticsearch/hs_err_pid%p.log** , -Xlog:gc*,gc+age=trace,safepoint:file=/var/log/elasticsearch/gc.log:utctime,pid,tags:filecount=32,filesize=64m, -Djava.locale.providers=COMPAT, -Dio.netty.allocator.type=unpooled, -XX:MaxDirectMemorySize=536870912, -Des.path.home=/usr/share/elasticsearch, -Des.path.conf=/etc/elasticsearch, -Des.distribution.flavor=default, -Des.distribution.type=rpm, -Des.bundled_jdk=true]
[2019-08-14T09:28:22,093][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [aggs-matrix-stats]
[2019-08-14T09:28:22,145][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [analysis-common]
[2019-08-14T09:28:22,146][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [data-frame]
[2019-08-14T09:28:22,147][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [ingest-common]
[2019-08-14T09:28:22,147][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [ingest-geoip]
[2019-08-14T09:28:22,148][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [ingest-user-agent]
[2019-08-14T09:28:22,149][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [lang-expression]
[2019-08-14T09:28:22,149][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [lang-mustache]
[2019-08-14T09:28:22,150][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [lang-painless]
[2019-08-14T09:28:22,150][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [mapper-extras]
[2019-08-14T09:28:22,151][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [parent-join]
[2019-08-14T09:28:22,152][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [percolator]
[2019-08-14T09:28:22,152][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [rank-eval]
[2019-08-14T09:28:22,153][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [reindex]
[2019-08-14T09:28:22,154][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [repository-url]
[2019-08-14T09:28:22,155][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [transport-netty4]
[2019-08-14T09:28:22,155][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [x-pack-ccr]
[2019-08-14T09:28:22,156][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [x-pack-core]
[2019-08-14T09:28:22,156][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [x-pack-deprecation]
[2019-08-14T09:28:22,157][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [x-pack-graph]
[2019-08-14T09:28:22,158][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [x-pack-ilm]
[2019-08-14T09:28:22,158][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [x-pack-logstash]
[2019-08-14T09:28:22,159][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [x-pack-ml]
[2019-08-14T09:28:22,160][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [x-pack-monitoring]
[2019-08-14T09:28:22,160][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [x-pack-rollup]
[2019-08-14T09:28:22,161][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [x-pack-security]
[2019-08-14T09:28:22,162][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [x-pack-sql]
[2019-08-14T09:28:22,163][INFO ][o.e.p.PluginsService ] [localhost.localdomain] loaded module [x-pack-watcher]
[2019-08-14T09:28:22,165][INFO ][o.e.p.PluginsService ] [localhost.localdomain] no plugins loaded
[2019-08-14T09:28:57,492][INFO ][o.e.x.s.a.s.FileRolesStore] [localhost.localdomain] parsed [0] roles from file [/etc/elasticsearch/roles.yml]
[2019-08-14T09:29:15,346] **[ERROR][o.e.b.Bootstrap ]**  [localhost.localdomain] Exception

Please format your code, logs or configuration files using </> icon as explained in this guide and not the citation button. It will make your post more readable.

Or use markdown style like:

```
CODE
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Lots of people read these forums, and many of them will simply skip over a post that is difficult to read, because it's just too large an investment of their time to try and follow a wall of badly formatted text.
If your goal is to get an answer to your questions, it's in your interest to make it as easy to read and understand as possible.
Please update your post.

Also provide what you have exactly after this last line.

And then read https://www.elastic.co/guide/en/elasticsearch/reference/current/bootstrap-checks.html