Prepares an DeleteCommand.DeleteElement.

Performs a bulk operation using many deletes, each can delete multiple documents.

import scala.concurrent.{ ExecutionContext, Future }

import reactivemongo.api.bson.BSONDocument
import reactivemongo.api.bson.collection.BSONCollection

def bulkDelete(
  coll: BSONCollection,
  docs: Iterable[BSONDocument])(implicit ec: ExecutionContext) = {
  val delete = coll.delete(ordered = true)
  val elements = Future.sequence(docs.map { doc =>
    delete.element(
      q = doc,
      limit = Some(1)) // only first match
  })

  elements.flatMap { ops =>
    delete.many(ops) // Future[MultiBulkWriteResult]
  }
}

Performs a delete with a one single selector (see DeleteCommand.DeleteElement). This will delete all the documents matched by the q selector.