revert

Author: tlrx

server/src/main/java/org/elasticsearch/repositories/blobstore/BlobStoreRepository.java

@@ -440,7 +440,7 @@ public static String getRepositoryDataBlobName(long repositoryGeneration) {
 
     private final NamedXContentRegistry namedXContentRegistry;
 
-    protected BigArrays bigArrays;
+    protected final BigArrays bigArrays;
 
     /**
      * Flag that is set to {@code true} if this instance is started with {@link #metadata} that has a higher value for