static File[] getBloomFilterFilesForLogSegment(String dataDir, LogSegmentName logSegmentName) {
   return new File(dataDir).listFiles(new FilenameFilter() {
      @Override
      public boolean accept(File dir, String name) {
        if (logSegmentName.toString().isEmpty()) {
          return name.endsWith(IndexSegment.BLOOM_FILE_NAME_SUFFIX);
        } else {
          return name.startsWith(logSegmentName + BlobStore.SEPARATOR) &&
              name.endsWith(IndexSegment.BLOOM_FILE_NAME_SUFFIX);
        }
      }
    });
  }
Gets the list of bloom filter files that refer to the log segment with name {@code logSegmentName}.
@param dataDir the directory where the index files are.
@param logSegmentName the name of the log segment whose bloom filter files are required.
@return the list of bloom filter files that refer to the log segment with name {@code logSegmentName}.
ambry-store/src/main/java/com/github/ambry/store/PersistentIndex.java