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brew install elasticsearch

elasticsearch: Java 1.7+ is required to install this formula.
You can install with Homebrew Cask:
  brew install Caskroom/cask/java

You can download from:
  http://www.oracle.com/technetwork/java/javase/downloads/index.html
Error: An unsatisfied requirement failed this build.

brew tap caskroom/cask

Warning: Tap caskroom/cask already tapped.

brew install brew-cask

Error: No available formula with the name "brew-cask"
==> Searching for similarly named formulae...
Error: No similarly named formulae found.
==> Searching taps...
This formula was found in a tap:
Caskroom/cask/brew-cask-completion
To install it, run:
  brew install Caskroom/cask/brew-cask-completion
==> You haven't updated Homebrew in a while.
A formula for brew-cask might have been added recently.
Run `brew update` to get the latest Homebrew updates!

brew cask install java

==> brew cask install Caskroom/cask/brew-cask-completion
Error: Unknown command: cask

brew upgrade brew-cask

Error: No available formula with the name "brew-cask"