Log: add new line method
Searcher: log scoring and ranking calculations
Indexer: rename getTermFrequency to getTermOccurrence

more valid name in this case
Indexer: rename getTermFrequency to getDocumentOccurrence

more valid name
client: search result is scrollable
fix idf calculation
Indexer: rename getFrequency to getOccurrence

more valid name
Indexer: remove useless getFrequency
TermsCollection: remove useless code