jpountz commented on a change in pull request #796: LUCENE-8927: Set.copyOf and 
Set.of instead of Collections.unmodifiabl…
URL: https://github.com/apache/lucene-solr/pull/796#discussion_r305266078
 
 

 ##########
 File path: lucene/core/src/java/org/apache/lucene/index/FieldInfos.java
 ##########
 @@ -422,6 +422,10 @@ synchronized boolean contains(String fieldName, 
DocValuesType dvType) {
       }
     }
     
+    synchronized Set<String> getFieldNames() {
+      return Set.copyOf(nameToNumber.keySet());
+    }
 
 Review comment:
   we should not resurrect this method that we just removed

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