And while we're at it, try to fix existing bugs.
Note that the Elasticsearch side is implemented in Search 5 using multi-fields; maybe we could wait for HSEARCH-3465 to introduce user APIs for multi-fields, and rely on that for faceting?
In particular:
* HSEARCH-2668
* HSEARCH-1889 and HSEARCH-1343 (they are related)
* See also HSEARCH-2472
There will be work both on the mapping side and on the search query DSL side.
Also, discussed during the F2F meeting:
* Define all the facets when you build the query and then on the query you define the filter that you need.
* We should try to execute only one query [probably relates to the Lucene impl ?]
See org.hibernate.search.v6poc.search.query.spi.SearchQueryBuilder for passing faceting options to the backend.
See org.hibernate.search.v6poc.search.SearchResult for returning faceting results.
For testing, see also the showcase, where we want to add a demonstration of faceting.
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