Usage of spray directives

gistfile1.scala

def listQueryHistogram(username: String, focussetId: String) =
  (ekhoAuth(GET, Some(username), Some(focussetId)) &
  params &
  parameters('queries) &
  detach())
  {
    // The first two are the values extracted by params and parameterers directives
    (params, queries) => ctx =>

    val theList = queries.split(",").toList
    val groups = ElasticsearchFilteredAggHelper.multiTextQueryAgg(focussetId = focussetId,
    interval = params.interval, query = params.query,
    fromDate = params.fromDate, toDate = params.toDate,
    preZone = params.preZone, postZone = params.postZone,
    filterList = theList )
    ctx.complete(groups)
  }