This question is very similar to its famed windows 7 counterpart, but the same solution no longer works on windows 10 so it seems like the new platform is worthy of its own question.
Of course, everybody who uses eclipse on windows has hit this age old bug at one point of another - documented here - but for those who aren't familiar, the TL;DR is that you get two taskbar icons for eclipse because the eclipse launcher (eclipse.exe) and the eclipse workspace (JVM) are two separate processes and you can't pin the workspace process. It looks like they wont fix this in the near term so we're reliant on workarounds for now.
Has anybody gotten eclipse to work with Windows 10 taskbar? What about start menu search (a.k.a. cortana). The post here walks through start menu pinning but windows search doesn't pick up the shortcut, unfortunately