in src/main/scala/datastore/ElasticsearchRepo.scala [232:238]
def tagTransform(j:Json) = j.as[Tag] match {
case Right(t)=>Some(t)
case Left(err)=>
val tagId = (j \\ "id").headOption.map(_.asString).getOrElse("unknown tag id")
logger.error(s"Could not unmarshal tag for $tagId: $err")
None
}