Move Elasticsearch config settings into application settings
As mentioned by @vsizov:
@patricio @stanhu I see no reason to not put it to the Application Settings. The only weird thing is that you need to go to the terminal anyway if you want to enable ES again or first time. I mean you need to create indexes or/and index/reindex content. So it will look a bit inconsistent, but it's not that big problem if we make it clear in the option description in the UI.
Admins need to be able to disable/enable Elasticsearch and change its configuration without restarting all the processes.