The wiki page (http://wiki.apache.org/solr/MoreLikeThis) says:

mlt.fl: The fields to use for similarity. NOTE: if possible, these
should have a stored TermVector

I didn't set TermVector to true MoreLikeThis with StandardRequestHandler seems
to work fine. The first question is, is TermVector only for
performance optimization?

The second question is, afterI changed the mlt.fl fields from both
indexed and stored
to indexed only, I started to get zero results back. Do mlt.fl fields
always need to
be stored?

Thanks

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