You may be enamored with the "nothing new under the sun" idea that "Turing complete is Turing complete, anything you can do in Python you can do in Brainfuck" but as someone who has written code professionally in about a dozen languages, no, you can't just as easily get the same kind of parallelism out of Java as you can Elixir. To assert otherwise is factually false.
Is it possible to get to the same result? Yes. It is not, however, anywhere in Elixir's ballpark of "easily". Do not discount the power of language-level, not just support, but encouragement. Especially when you're working with junior devs, if "the right thing" and "the thing the language wants you to write" are not in alignment, everything is much, much harder. Erlang and Elixir actively encourage easily parallelized code. Java activity encourages tangles of objects.
Is it possible to get to the same result? Yes. It is not, however, anywhere in Elixir's ballpark of "easily". Do not discount the power of language-level, not just support, but encouragement. Especially when you're working with junior devs, if "the right thing" and "the thing the language wants you to write" are not in alignment, everything is much, much harder. Erlang and Elixir actively encourage easily parallelized code. Java activity encourages tangles of objects.