code: public static LoadMetadataContext mergeFrom(LoadMetadataPOptions.Builder optionsBuilder) {
      LoadMetadataPOptions masterOptions =
          FileSystemOptions.loadMetadataDefaults(ServerConfiguration.global());
      LoadMetadataPOptions.Builder mergedOptionsBuilder =
          masterOptions.toBuilder().mergeFrom(optionsBuilder.build());
      return create(mergedOptionsBuilder);
    }
docs: Merges and embeds the given {@link LoadMetadataPOptions} with the corresponding master options.
  
  @param optionsBuilder Builder for proto {@link LoadMetadataPOptions} to embed
  @return the instance of {@link LoadMetadataContext} with default values for master