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