elasticsearch安装插件elasticsearch-head-master，跨域时报错

我在文件：elasticsearch.yml末尾添加：
http.cors.enabled: true
http.cors.allow-origin: "*"
http.cors.allow-headers: Authorization
 
结果报错，报错信息：

[2018-04-25T13:06:46,900][INFO ][o.e.p.PluginsService     ] [B3RM21M] no plugins loaded
[2018-04-25T13:06:47,386][ERROR][o.e.b.Bootstrap          ] Exception
java.lang.IllegalArgumentException: unknown setting [http.cors.allowed] did you mean any of [http.cors.allow-headers, http.cors.allow-methods, http.cors.enabled]?
at org.elasticsearch.common.settings.AbstractScopedSettings.validate(AbstractScopedSettings.java:293) ~[elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.common.settings.AbstractScopedSettings.validate(AbstractScopedSettings.java:256) ~[elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.common.settings.SettingsModule.<init>(SettingsModule.java:139) ~[elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.node.Node.<init>(Node.java:344) ~[elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.node.Node.<init>(Node.java:245) ~[elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.bootstrap.Bootstrap$5.<init>(Bootstrap.java:233) ~[elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:233) ~[elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:342) [elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:132) [elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:123) [elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:67) [elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:134) [elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.cli.Command.main(Command.java:90) [elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:91) [elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:84) [elasticsearch-5.6.0.jar:5.6.0]
[2018-04-25T13:06:47,390][WARN ][o.e.b.ElasticsearchUncaughtExceptionHandler] [] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: java.lang.IllegalArgumentException: unknown setting [http.cors.allowed] did you mean any of [http.cors.allow-headers, http.cors.allow-methods, http.cors.enabled]?
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:136) ~[elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:123) ~[elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:67) ~[elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:134) ~[elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:91) ~[elasticsearch-5.6.0.jar:5.6.0]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:84) ~[elasticsearch-5.6.0.jar:5.6.0]