Needs TermFreqeuency from the index

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Needs TermFreqeuency from the index

Hi All,
We are trying to fetch the TermFreq from the lucene index, using IndexReader.getTermFreqVectors().

But the problem here is, if none of the fields in the index is Vectorized, then the above function call returns null. In my index, none of the fields are vectorized. Without re-creating the index, is it possible to get the TermFreqVector ?

Thanks in advance.

Suresh N.