How to find the paper that initializes a new field Problem

I am now working on a relatively new field in machine learning. My advisor suggested me to read milestone papers in this field. I think The first paper that proposed the problem is surely an important one. However, I do not know how to find it even after reading several review papers (actually none of them mentions the origin of the field).

Though finding the origin of the field may not sound useful, it is important to me since I have some fundamental doubts about the problem description, etc.

Could anyone help me, thank you in advance.
THe Wikipedia article on this topic is reasonably good and has some references.  I would look at that article and the references within.
Try tracing back "references of references" of reviews or important papers.  (You don't have to read in depth.)  But you may figure out the better papers.  May also find those that have a perspective on (3).
In general, I think "machine learning" is a misnomer and a buzzword.  Talking about it as some organic "thing" is not correct.  You should see it as a bit of a fad (especially the use of the term) and within the broader fields of statistics, algorithms, optimization, etc.  It's not like discovering X-rays or something.