"bolt" and "swirl" when talking about beverages

[mavisol]

Please can someone explain to me what do "swirl" and "bolt" mean when talking about beverages, specifically, teas? I think I understand, and still I want to have a clearer idea because I'm translating the text and people will read it.
The phrases (from an ad):
"our orange tea... is an orange bolt of energizing flavor"
"our plum tea... is a ruby-red swirl overflowing with the invigorating scent"