get frequency of each term from a document

[Ziqi Zhang]

Hi

Is it possible to get a list of terms within a document, and also TF of 
each of these terms *in that document only*? (Lucene 5.3)

IndexReader has a method "Terms getTermVector(int docID, String field)", 
which gives me a "Terms" object, on which I can get a TermsEnum. But I 
do not know where to go then.

thanks