Enabling watcher

[Raghuveer_SJ (Raghuveer)]

I am using 6.3 version of ELK. Using the following configuration in elasticsearch.yml :

1. What is the username for elasticsearch ?
2. Can i set in yml like bootstrap.username=myname ?
3. I need to enable the email option with trial license to show a demo is it possible because if i add the configuration as mentioned below i see the configuration is not recognized message.

action.auto_create_index: true
xpack.watcher.enabled: true
xpack.watcher.history.cleaner_service.enabled: true
xpack.monitoring.enabled: true

xpack.notification.email.account:
gmail_account:
profile: gmail
smtp:
auth: true
starttls.enable: true
host: smtp.gmail.com
port: 587
to: raghu@gmail.com
subject: "critical event spotted by ELK from : %{host}"
user: raghuveer@gmail.com
password:

So i see that x-pack is already there with this version and trying to start with trial license, getting following exception :

org.elasticsearch.bootstrap.StartupException: java.lang.IllegalArgumentException: unknown setting [xpack.notification.email.account.gmail_account.smtp.to] please check that any required plugins are installed, or check the breaking changes documentation for removed settings
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:140) ~[elasticsearch-6.3.0.jar:6.3.0]
at org.elasticsearch.bootstrap.Elasticsearch.execute(Elasticsearch.java:127) ~[elasticsearch-6.3.0.jar:6.3.0]
at org.elasticsearch.cli.EnvironmentAwareCommand.execute(EnvironmentAwareCommand.java:86) ~[elasticsearch-6.3.0.jar:6.3.0]
at org.elasticsearch.cli.Command.mainWithoutErrorHandling(Command.java:124) ~[elasticsearch-cli-6.3.0.jar:6.3.0]
at org.elasticsearch.cli.Command.main(Command.java:90) ~[elasticsearch-cli-6.3.0.jar:6.3.0]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:93) ~[elasticsearch-6.3.0.jar:6.3.0]
at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:86) ~[elasticsearch-6.3.0.jar:6.3.0]
Caused by: java.lang.IllegalArgumentException: unknown setting [xpack.notification.email.account.gmail_account.smtp.to] please check that any required plugins are installed, or check the breaking changes documentation for removed settings
at org.elasticsearch.common.settings.AbstractScopedSettings.validate(AbstractScopedSettings.java:344) ~[elasticsearch-6.3.0.jar:6.3.0]
at org.elasticsearch.common.settings.AbstractScopedSettings.validate(AbstractScopedSettings.java:308) ~[elasticsearch-6.3.0.jar:6.3.0]
at org.elasticsearch.common.settings.AbstractScopedSettings.validate(AbstractScopedSettings.java:282) ~[elasticsearch-6.3.0.jar:6.3.0]
at org.elasticsearch.common.settings.SettingsModule.(SettingsModule.java:135) ~[elasticsearch-6.3.0.jar:6.3.0]
at org.elasticsearch.node.Node.(Node.java:339) ~[elasticsearch-6.3.0.jar:6.3.0]
at org.elasticsearch.node.Node.(Node.java:252) ~[elasticsearch-6.3.0.jar:6.3.0]
at org.elasticsearch.bootstrap.Bootstrap$5.(Bootstrap.java:213) ~[elasticsearch-6.3.0.jar:6.3.0]
at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:213) ~[elasticsearch-6.3.0.jar:6.3.0]
at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:326) ~[elasticsearch-6.3.0.jar:6.3.0]
at org.elasticsearch.bootstrap.Elasticsearch.init(Elasticsearch.java:136) ~[elasticsearch-6.3.0.jar:6.3.0]
... 6 more