code: func (b *BloomIndexer) Process(ctx context.Context, header *types.Header) error {
  	b.gen.AddBloom(uint(header.Number.Uint64()-b.section*b.size), header.Bloom)
  	b.head = header.Hash()
  	return nil
  }
docs: // Process implements core.ChainIndexerBackend, adding a new header's bloom into
  // the index.