For TF Weight simply return the absolute TF.
For TF Weight simply return the absolute TF.
Note: We do not use Lucene 4.6's DefaultSimilarity's TF calculation here which returns:
sqrt(tf)
this is consistent with the MapReduce seq2sparse implementation of TF weights.
term freq
doc freq - UNUSED
Length of the document - UNUSED
the total number of docs - UNUSED based on term frequency only - UNUSED
The weight = tf param