code: public void setCollection(String collection) throws PageException {
  	try {
  	    this.collection = pageContext.getConfig().getSearchEngine(pageContext).getCollectionByName(collection.toLowerCase().trim());
  	}
  	catch (SearchException e) {
  	    throw Caster.toPageException(e);
  	}
  
      }
docs: set the value collection Specifies a collection name. If you are indexing an external collection
  external = "Yes", specify the collection name, including fully qualified path.
  
  @param collection value to set
  @throws PageException