The newly introduced MoreLikeThis Query Parser (
SOLR-6248) does not return any results when supplied with multiple fields in the qf parameter.
To reproduce within the techproducts example, compare:
The first two queries return 8 and 5 results, respectively. The third query doesn't return any results (not even the matched document).
In contrast, the MoreLikeThis Handler works as expected (accounting for the default mintf and mindf values in SimpleMLTQParser):
After adding the following line to example/techproducts/solr/techproducts/conf/solrconfig.xml:
The first two queries return 7 and 4 results, respectively (excluding the matched document). The third query returns 7 results, as one would expect.