No, open source means the same thing it's always meant since the term was first coined. See the Open Source Initiative's Open Source Definition: https://opensource.org/osd.
Now someone will respond "why does OSI get to decide the meaning of the term?" Well, they don't have any _legal_ right to do so, but if you don't accept their definition, does that mean every person gets to come up with their own definition? And if they do, what's the point of using the term?
So it makes sense to take OSI's definition as canonical, the same way the Free Software Foundation's definition of Free Software is generally considered canonical (https://www.gnu.org/philosophy/free-sw.html).
Also, to forestall another common reply, I'm not defending Amazon or attacking Elastic. I'm simply trying to define a term that's at the center of this discussion. If we can't agree on the definition, then any discussion of whether a license is open source is moot. The same goes for discussing the impact and value of open source vs non-open licenses.