cubicweb-elasticsearch #17069804 make doc_type customizable via Adapter [validation pending]

when pushing document into Elasticsearch we should be able to customize doc_type

prioritynormal
typetask
done in0.4.0
load0.100
load left0.000
closed by#9e877d975a94 [hook] use `serializer.doc_type` if exists (closes #17069804)
patch[hook] use `serializer.doc_type` if exists (closes #17069804) [applied]