Our organization spent two years going through these gyrations for elastic search. They failed. It never happened. No other solution was brought on board, they simply couldn't justify the cost. All told they spend hundreds of thousands of dollars to come up empty-handed. Meanwhile my new team had a project where elastic search was the obvious component as part of the solution and we simply used that service on AWS. Done.
It's been a while since I've worked at a startup or a mid-cap company, but for any company in the Fortune 500? Cloud is a godsend!