public BloomTokenFilter(org.apache.hadoop.util.bloom.Filter filter,
filter - tokens will be checked for membership in this bloom filter
in - the tokenstream to read.
keepMembers - keep memoers of the bloom filter? If true works like
a whitelist and members found in the list are kept and all others are
dropped. If false works like a stoplist and members found in the
filter are dropped all others are kept.