I don't know what that IP address is, because it was not my IP on the old server I dont think. But we just did a Plesk migration from one box to a new box and elastic search stopped working. Possible fix?
127.0.0.1 is localhost, eg. a loopback interface pointing to the server itself.
I am not familiar with Plesk, but I doubt it will handle the migration of an Elasticsearch installation.
So you will most likely have to install Elasicsearch manually.