PLT-6474 Basic Elasticsearch System Console Page (#6825)

* PLT-6474: Basic System Console Elasticsearch Config.

* Fix review comments.

* More review fixes.

* Review comments.

model/config.go

@@ -1662,8 +1662,6 @@ func (o *Config) Sanitize() {
 		o.SqlSettings.DataSourceSearchReplicas[i] = FAKE_SETTING
 	}
 
-	*o.ElasticSearchSettings.ConnectionUrl = FAKE_SETTING
-	*o.ElasticSearchSettings.Username = FAKE_SETTING
 	*o.ElasticSearchSettings.Password = FAKE_SETTING
 }