[siweia]

Hmmm, it works perfectly now. Although it is not Bolstering this week in mythic +.

If someone interested about this and want to have a go, you can just change the customfilter as below to test it.

local function customFilterForBolster(element, _, button, name, _, _, _, _, _, _, _, _, _, spellID)
	if name then
		element.bolster = element.bolster + 1
		if not element.bolsterIndex then
			element.bolsterIndex = button
			return true
		end
	end
end

And there would be just one icon shows up and it counts how many auras the unit owns.