According to this Office Support article, "Search limits for SharePoint Online", SP Online has a limit of 500 rows in a result set, and that is a hard boundary.
Is that really saying what I think it's saying? That SP Online search is only going to return 500 search results?
It then goes on to say: "To display the entire result set, issue more paging queries."
What is a paging query, and how does one construct and issue one?