lucene_snapshot: fix another instance of IOContext.READONCE

Author: elasticsearchmachine

server/src/main/java/org/elasticsearch/common/lucene/Lucene.java

@@ -241,7 +241,7 @@ public static void checkSegmentInfoIntegrity(final Directory directory) throws I
 
             @Override
             protected Object doBody(String segmentFileName) throws IOException {
-                try (IndexInput input = directory.openInput(segmentFileName, IOContext.READ)) {
+                try (IndexInput input = directory.openInput(segmentFileName, IOContext.READONCE)) {
                     CodecUtil.checksumEntireFile(input);
                 }
                 return null;