Hi there, the question of Irish "slavery" comes up on this sub from time to time. Here are a couple answers to get you started:

https://www.reddit.com/r/AskHistorians/comments/1ou972/are_there_any_sources_regarding_irish_slavery_in/

https://www.reddit.com/r/AskHistorians/comments/135hja/were_there_irish_slaves_that_were_legitimate/c71h2y8

I also know that u/sowser has written quite a bit on this, but for some reason their answers aren't in our FAQ section.