Modify title page identification

indexer/solr/solr.go

@@ -946,8 +946,16 @@ func WriteToGDZIndex(esDoc types.ESDoc) {
 		}
 	}
 
+	// TODO check this
 	if pos := firstOccurence(solrDoc.LogType, []string{"titlepage", "title_page", "title-page"}); pos != -1 {
-		solrDoc.TitlePage = physPageKey[pos]
+		ppos := solrDoc.LogStartPageIndex[pos]
+
+		if (ppos < 0) || (int(ppos)-1) >= len(physPageKey) {
+			log.Printf("ERROR index out of range in %s -> pos: %v, ppos: %v, len(physPageKey): %v\nphysPageKey: %v\nsolrDoc.LogStartPageIndex: %v", solrDoc.ID, pos, ppos, len(physPageKey), physPageKey, solrDoc.LogStartPageIndex)
+
+		} else {
+			solrDoc.TitlePage = physPageKey[ppos-1]
+		}
 	}
 
 	if len(solrLogChildDocs) > 0 {