diff --git a/lib/elasticsearch/config.js b/lib/elasticsearch/config.js
index c499a78a..6b5133b8 100644
--- a/lib/elasticsearch/config.js
+++ b/lib/elasticsearch/config.js
@@ -121,7 +121,7 @@ const FILTER_CONFIG = {
   titleAlt: { operator: 'match', field: ['titleAlt.raw', 'parallelTitleAlt.raw'], repeatable: true },
   uniformTitle: { operator: 'match', field: ['uniformTitle.raw', 'parallelUniformTitle.raw'], repeatable: true },
   addedAuthorTitle: { operator: 'match', field: ['addedAuthorTitle.raw', 'parallelAddedAuthorTitle.raw'], repeatable: true },
-  series: { operator: 'match', field: ['series', 'parallelSeries', 'seriesUniformTitle', 'parallelSeriesUniformTitle', 'seriesAddedEntry', 'parallelSeriesAddedEntry'], repeatable: true },
+  series: { operator: 'match', field: ['series', 'parallelSeries', 'seriesUniformTitle.keyword', 'parallelSeriesUniformTitle.keyword', 'seriesAddedEntry.keyword', 'parallelSeriesAddedEntry.keyword'], repeatable: true },
   placeOfPublication: { operator: 'match', field: ['placeOfPublication', 'parallelPlaceOfPublication'], repeatable: true },
   dateFrom: {
     operator: 'custom',