That's a load of rubbish. Elasticsearch is actually released and regularly updated in several versions.
If you are using a hoster, it is likely that they don't/won't give you the freedom to install use Elasticsearch, which relies on the Java virtual machine to run. Thus, if you can't use Elasticsearch+Java, you wouldn't be able to run XenForo Enhanced Search on your forum. I had this same problem when I used the hosting company 1&1 to host my forum. Moving to Linode and running my forum in a virtual machine gave me complete freedom to install and run whatever software I want to, including Enhanced Search.