private static void processSync( String listNewJSON, String recordTypesJSON, boolean isUpdate ) {

    if ( listNewJSON != null ) {
          List<Contact> triggerNew = (List<Contact>)JSON.deserialize( listNewJSON, List<Contact>.class );
          Map<String,Id> recordTypesMap = (Map<String,Id>)JSON.deserialize( recordTypesJSON, Map<String,Id>.class ); //a map, e.g., {AccountStudentRecord": "012a0000001ZMUzAAO"}
          List<Id> contactRecordTypeIds = new List<Id>();
          for ( String recordTypeReference : recordTypesMap.keySet() ) {
            if ( recordTypeReference.startsWith('Contact') ) {
                contactRecordTypeIds.add( recordTypesMap.get(recordTypeReference) );
            }
          }

                    List<StudentSearchHash__c> newHashes = new List<StudentSearchHash__c>();
                    List<StudentSearchHash__c> hashesForUpdate = new List<StudentSearchHash__c>();

                    for ( Contact thisContact: [Complicated nested SOQL IN :triggerNew]) {
//If I add here SOQL still runs recursivly, but logic executes one time. If!TriggerMonitor.ExecutedTriggerMethods.contains('updateSyncTrigger'+String.valueof(thiscontact.id));  {TriggerMonitor.ExecutedTriggerMethods.add('updateSyncTrigger'+String.valueof(thiscontact.id));

                         // do stuff
                             }}}