Today I was reading about breaking changes in the upcoming 5.0 release of elasticsearch. I read about indexes that are created in 1.x cannot be migrated to 5.x. Even if they were created in the 1.x, migrated to 2.x they cannot be run in 5.x. Luckily there is a migration plugin for 2.4.x. To be a little bit prepared, I wanted to try it out for myself.