Hello! I need the plugin for the version of spigot 1.8. I need a HealthBar, which will show your number of hearts in round numbers. Well, it will be displayed in ActionBar, and minecraft's heart defaulting will remain the same. That is, if you have more than 20 HP, the fact that they HealthBar will be displayed, and in default hearts no. Example: a player has 30 HP. Maynkrafta's heart default is still 20, and the HealthBar itself says "30/30 HP". I think you understand.
https://www.spigotmc.org/resources/action-bar-health.2661/ I belive that is what you want. This plugin shows you enemy healt (mobs/players) when you fight with them in actionbar. You have many options for display healt. This plugin is not made by me but you can find it on google