US ESTA expired passport issued by a different country

[weggaa]

Hi, I was a citizen of country X then revoked it to become the citizen of country Y. Now I am filling the US esta form and currently at the question "Have you ever been issued a passport or national identity card for travel by any other country?", if I choose yes then I will need to enter the document number. In the past I had a passport from country X, but it expired a long time ago and I don't remember its document number, so how should I proceed https://100001.onl/ https://1921681254.mx/ ?