You don't need the TermVectorComponent at all for MLT.

The reason the Term Vector is suggested for the fields you are interested
in, is just because this will speed up the way the MLT will retrieve the
"interesting terms" out of your seed document to build the MLT query.

If you don't have the Term Vector enabled, the MLT will analyse the content
of fields on the fly with the analysis chain in input.

Cheers



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Alessandro Benedetti
Search Consultant, R&D Software Engineer, Director
Sease Ltd. - www.sease.io
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