Add Issn to structrun info

this info helps the ISSN resolver to get volumes, related to specific periodical (issn), in a single query

indexer/index/elasticsearch.go

@@ -495,6 +495,7 @@ func GetESLogFromDmdsec(
 					structrun.Type = parentEsLog.Type
 					structrun.RightsAccessConditionInfos = parentEsLog.RightsAccessConditionInfos
 					structrun.Dc = parentEsLog.Dc
+					structrun.Issn = parentInfo.Issn
 					structrun.Currentno = parentEsLog.Currentno
 					structrun.Currentnosort = parentEsLog.Currentnosort
 					structrun.Issn = parentEsLog.Issn

indexer/mets/mets.go

@@ -565,9 +565,8 @@ func ProcessMetsWorker(mythread int) {
 		}
 
 		var dateIndexed, dateModified string
-		// TODO request only once, dates are the same
+
 		if config.CContext == "digizeit" {
-			//dateIndexed, dateModified = index.GetUpdateDatesFromES(metsObject.RecordIdentifier, redisClient)
 			dateIndexed, dateModified = index.GetUpdateDatesFromRedis(metsObject.RecordIdentifier, redisClient)
 		} else if config.CContext == "nlh" {
 			dateIndexed, dateModified = index.GetUpdateDatesFromSolrNLH(metsObject.RecordIdentifier, redisClient)