question: protected Collection < CommunicationSummaryStatistics > doGetCommunicationSummaryStatistics ( String tenantId , Criteria criteria ) { String index = client . getIndex ( tenantId ) ; Map < String , CommunicationSummaryStatistics > stats = new HashMap < > ( ) ; if ( ! criteria . transactionWide ( ) ) { Criteria txnWideCriteria = criteria . deriveTransactionWide ( ) ; buildCommunicationSummaryStatistics ( stats , index , txnWideCriteria , false ) ; } buildCommunicationSummaryStatistics ( stats , index , criteria , true ) ; return stats . values ( ) ; }
target:  This method returns the flat list of communication summary stats.