We are using the ELK stack at work for a bigger project and recently we come across creating some custom plugins. However, I'm not sure what version of bootstrap is embedded into Kibana. I'm trying to use some components and styles and sometimes they work, sometime not. Among the installed modules for the plugin, I have "angular-ui-bootstrap": "2.5.6" . Right now I am using the 6.2.3 release, but I can switch if needed (preferably I'd like to use Bootstrap v4).