I just installed ES on Mac OS X using Homebrew and got a warning near
Warning: JARs were installed to "lib".
Installing JARs to "lib" can cause conflicts between packages.
For Java software, it is typically better for the formula to
install to "libexec" and then symlink or wrap binaries into "bin".
See "activemq", "jruby", etc. for examples.
I have no idea about that and just started using a Mac, don't know if
that's important nor whether it should be reported here or somewhere
else, but I just want to notify you.