Endpoint with vars

gql-elastic.endpoint.scala

QueryParser.parse(query) match {
    case Success(queryAst) =>
      val variables = fields.get("variables") match {
        case Some(obj: JsObject) => obj
        case _                   => JsObject.empty
      }

      complete(executeGraphQLQuery(queryAst, None, variables))
    case Failure(error) =>
      complete(BadRequest, JsObject("error" -> JsString(error.getMessage)))
  }