We can accept a pull request if you already worked on this, it's reasonably well tested and it really adds something, but be aware that translation of Lucene analyzer definitions into Elasticsearch analyzer definitions has been dropped in Hibernate Search 6, where you have to define everything using the language of your backend of choice (Lucene or Elasticsearch).

In Hibernate Search 5, I would recommend using analyzer providers, which are close to what Hibernate Search 6 exposes.