org.hibernate.search.analyzer.Discriminator allows to dynamically choose the analyzer to use on each field based on the value of one entity property.
This can't be done on Elasticsearch, as analyzers are defined by the mapping, and cannot be specified when indexing.

We should either:

• Find a way to implement this (unlikely).
• Provide an alternative to Elasticsearch backend users. The Elasticsearch doc advises to use fields to address a similar use case: https://www.elastic.co/guide/en/elasticsearch/reference/2.4/multi-fields.html#_multi_fields_with_multiple_analyzers
• Or at the very least, document the lack of support and the fact that it will stay that way