private boolean closeDeleteFamilyBloomFilter() throws IOException {
      boolean hasDeleteFamilyBloom = closeBloomFilter(deleteFamilyBloomFilterWriter);

      // add the delete family Bloom filter writer
      if (hasDeleteFamilyBloom) {
        writer.addDeleteFamilyBloomFilter(deleteFamilyBloomFilterWriter);
      }

      // append file info about the number of delete family kvs
      // even if there is no delete family Bloom.
      writer.appendFileInfo(DELETE_FAMILY_COUNT, Bytes.toBytes(this.deleteFamilyCnt));

      return hasDeleteFamilyBloom;
    }
For unit testing only.
@return the Bloom filter used by this writer.
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/StoreFileWriter.java