One thing that really bothers me about ES is that compared to Solr, some terms that have a specific meaning in Lucene are either not used for the corresponding

One thing that really bothers me about ES is that compared to Solr, some terms that have a specific meaning in Lucene are either not used for the corresponding concept or even worse re-used for a different one. It sometimes makes explaining the underlying implementation a bit harder to people who are Lucene-agnostic but are ES users, with no good reason apart from, I would guess, brand differentiation?