adjust the size of the highlights fragments

src/app/elasticsearch/services/elasticsearch.service.ts

@@ -241,11 +241,13 @@ export class ElasticsearchService {
             number_of_fragments: 0,
           },
           'metadata-fr.abstract': {
-            number_of_fragments: 50,
+            fragment_size: 50,
+            number_of_fragments: 5,
           },
           'metadata-fr.lineage': {
-            number_of_fragments: 50,
-          }
+            fragment_size: 50,
+            number_of_fragments: 5,
+          },
         },
       },
     };