code: public Map<String, EntityDocument> wbGetEntities(
  			WbGetEntitiesActionData properties)
  			throws MediaWikiApiErrorException, IOException {
  		return wbGetEntities(properties.ids, properties.sites,
  				properties.titles, properties.props, properties.languages,
  				properties.sitefilter);
  	}
docs: Creates a map of identifiers or page titles to documents retrieved via
  the API URL
  
  @param properties
  parameter setting for wbgetentities
  @return map of document identifiers or titles to documents retrieved via
  the API URL
  @throws MediaWikiApiErrorException
  if the API returns an error
  @throws IOException
  if we encounter network issues or HTTP 500 errors from Wikibase