Add more attribute options; use Oracle JDK; SSL attributes now optional

Howdy,

Your elasticsearch opsworks cookbook looked pretty awesome, so I started using it. Then I found some stuff I needed to change for work (path to the data store), some things that didn't work (or don't work anymore); tweaked things to work for me (like being able to just do http)... etc.

I hope these changes are helpful. Let me know if I can fix/change anything to better help you.