Add replicas, we are unnecessarily setting it to 0 (#109640)

rest-api-spec/src/yamlRestTest/resources/rest-api-spec/test/search.highlight/60_unified_matched_fields.yml

@@ -10,7 +10,7 @@ setup:
             settings:
               index:
                 number_of_shards: 1
-                number_of_replicas: 0
+                number_of_replicas: 1
               analysis:
                 filter:
                   my_edge_ngram: