This question is based on the file format document.
http://lucene.apache.org/java/docs/fileformats.html
The following is my understanding. Is this correct
1) The .frq file is the most important file and that is where we get the
mapping of terms to documents.
2) The .prx file is used for answering queries like find docs that contain
Term A and Term B kind of queries.
3) The .tvx, .tvd and the .tvf files will not be created by default. you need
to set the storeTermVector as true. I am not able to appreciate the usefulness
of the the information stored in tv[x,d,f] files.
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