/**
  * Answers if a collection exists given its name
  *
  * <p>{@sample.xml ../../../doc/mongo-connector.xml.sample mongo:exists-collection}
  *
  * @param collection the name of the collection
  * @return if the collection exists
  */
 @Processor
 public boolean existsCollection(String collection) {
   return client.existsCollection(collection);
 }