Error message:

[2019-09-28T11:41:25,169][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [node-1] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.IllegalArgumentException: property [elasticsearch.version] is missing for plugin [head]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:140) ~[elasticsearch-6.3.2.jar:6.3.2]
	at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:127) ~[elasticsearch-6.3.2.jar:6.3.2]
	at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-6.3.2.jar:6.3.2]
	at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-6.3.2.jar:6.3.2]
	at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-6.3.2.jar:6.3.2]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:93) ~[elasticsearch-6.3.2.jar:6.3.2]
	at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:86) ~[elasticsearch-6.3.2.jar:6.3.2]
Caused by: java.lang.IllegalArgumentException: property [elasticsearch.version] is missing for plugin [head]
	at org.elasticsearch.plugins.PluginInfo.readFromProperties(PluginInfo.java:187) ~[elasticsearch-6.3.2.jar:6.3.2]
	at org.elasticsearch.plugins.PluginsService.readPluginBundle(PluginsService.java:484) ~[elasticsearch-6.3.2.jar:6.3.2]
	at org.elasticsearch.plugins.PluginsService.findBundles(PluginsService.java:463) ~[elasticsearch-6.3.2.jar:6.3.2]
	at org.elasticsearch.plugins.PluginsService.<init>(PluginsService.java:147) ~[elasticsearch-6.3.2.jar:6.3.2]
	at org.elasticsearch.node.Node.<init>(Node.java:311) ~[elasticsearch-6.3.2.jar:6.3.2]
	at org.elasticsearch.node.Node.<init>(Node.java:252) ~[elasticsearch-6.3.2.jar:6.3.2]
	at org.elasticsearch.bootstrap.Bootstrap$5.<init>(Bootstrap.java:213) ~[elasticsearch-6.3.2.jar:6.3.2]
	at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:213) ~[elasticsearch-6.3.2.jar:6.3.2]
	at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:326) ~[elasticsearch-6.3.2.jar:6.3.2]
	at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:136) ~[elasticsearch-6.3.2.jar:6.3.2]
	... 6 more

Reason for error: Placing the ES Head plug-in decompression package under the Plugins directory of the ES package causes an es startup error
Solution: Create a new directory under the es installation package and just move the location