This is my es log.
As I mentioned earlier, I already verified transport port and cluster name are correct by removing x-pack plugin and connecting successfully.
[2017-02-07T08:49:48,409][INFO ][o.e.n.Node ] [] initializing ...
[2017-02-07T08:49:48,472][INFO ][o.e.e.NodeEnvironment ] [v46nvy3] using [1] data paths, mounts [[/ (/dev/sda7)]], net usable_space [51.3gb], net total_space [83.9gb], spins? [no], types [ext4]
[2017-02-07T08:49:48,473][INFO ][o.e.e.NodeEnvironment ] [v46nvy3] heap size [1.9gb], compressed ordinary object pointers [true]
[2017-02-07T08:49:48,474][INFO ][o.e.n.Node ] node name [v46nvy3] derived from node ID [v46nvy3ITcSs62FewBiJlw]; set [node.name] to override
[2017-02-07T08:49:48,475][INFO ][o.e.n.Node ] version[5.1.1], pid[25472], build[5395e21/2016-12-06T12:36:15.409Z], OS[Linux/4.4.0-62-generic/amd64], JVM[Oracle Corporation/Java HotSpot(TM) 64-Bit Server VM/1.8.0_121/25.121-b13]
[2017-02-07T08:49:49,824][INFO ][o.e.p.PluginsService ] [v46nvy3] loaded module [aggs-matrix-stats]
[2017-02-07T08:49:49,824][INFO ][o.e.p.PluginsService ] [v46nvy3] loaded module [ingest-common]
[2017-02-07T08:49:49,824][INFO ][o.e.p.PluginsService ] [v46nvy3] loaded module [lang-expression]
[2017-02-07T08:49:49,824][INFO ][o.e.p.PluginsService ] [v46nvy3] loaded module [lang-groovy]
[2017-02-07T08:49:49,824][INFO ][o.e.p.PluginsService ] [v46nvy3] loaded module [lang-mustache]
[2017-02-07T08:49:49,824][INFO ][o.e.p.PluginsService ] [v46nvy3] loaded module [lang-painless]
[2017-02-07T08:49:49,824][INFO ][o.e.p.PluginsService ] [v46nvy3] loaded module [percolator]
[2017-02-07T08:49:49,825][INFO ][o.e.p.PluginsService ] [v46nvy3] loaded module [reindex]
[2017-02-07T08:49:49,825][INFO ][o.e.p.PluginsService ] [v46nvy3] loaded module [transport-netty3]
[2017-02-07T08:49:49,825][INFO ][o.e.p.PluginsService ] [v46nvy3] loaded module [transport-netty4]
[2017-02-07T08:49:49,825][INFO ][o.e.p.PluginsService ] [v46nvy3] loaded plugin [elasticsearch-analysis-mecab-ko]
[2017-02-07T08:49:49,825][INFO ][o.e.p.PluginsService ] [v46nvy3] loaded plugin [lang-javascript]
[2017-02-07T08:49:49,826][INFO ][o.e.p.PluginsService ] [v46nvy3] loaded plugin [x-pack]
[2017-02-07T08:49:50,135][INFO ][o.e.s.ScriptService ] [v46nvy3] compiling script file [/home/lks21c/elasticsearch-5.1.1/config/scripts/my_script.groovy]
[2017-02-07T08:49:52,425][INFO ][o.e.n.Node ] initialized
[2017-02-07T08:49:52,425][INFO ][o.e.n.Node ] [v46nvy3] starting ...
[2017-02-07T08:49:52,652][INFO ][o.e.t.TransportService ] [v46nvy3] publish_address {192.168.43.55:9300}, bound_addresses {[::]:9300}
[2017-02-07T08:49:52,657][INFO ][o.e.b.BootstrapCheck ] [v46nvy3] bound or publishing to a non-loopback or non-link-local address, enforcing bootstrap checks
[2017-02-07T08:49:55,818][INFO ][o.e.c.s.ClusterService ] [v46nvy3] new_master {v46nvy3}{v46nvy3ITcSs62FewBiJlw}{N7H5GCPnQbS7v57ikHcFkQ}{192.168.43.55}{192.168.43.55:9300}, reason: zen-disco-elected-as-master ([0] nodes joined)
[2017-02-07T08:49:55,832][INFO ][o.e.h.HttpServer ] [v46nvy3] publish_address {192.168.43.55:9200}, bound_addresses {[::]:9200}
[2017-02-07T08:49:55,833][INFO ][o.e.n.Node ] [v46nvy3] started
[2017-02-07T08:49:55,936][INFO ][o.e.g.GatewayService ] [v46nvy3] recovered [0] indices into cluster_state