# Package org.apache.lucene.codecs.bloom

package org.apache.lucene.codecs.bloom
Codec PostingsFormat for fast access to low-frequency terms such as primary key fields.

- Class
  Description
  BloomFilterFactory
  Class used to create index-time `FuzzySet` appropriately configured for each field.
  BloomFilteringPostingsFormat
  A `PostingsFormat` useful for low doc-frequency fields such as primary keys.
  DefaultBloomFilterFactory
  Default policy is to allocate a bitset with 10% saturation given a unique term per document.
  FuzzySet
  A class used to represent a set of many, potentially large, values (e.g.
  FuzzySet.ContainsResult
  Result from `FuzzySet.contains(BytesRef)`: can never return definitively YES (always MAYBE), but can sometimes definitely return NO.
  HashFunction
  Base class for hashing functions that can be referred to by name.
  MurmurHash64
  This is a very fast, non-cryptographic hash suitable for general hash-based lookup.