Did you look here?
https://cwiki.apache.org/confluence/display/solr/Working+with+External+Files+and+Processes
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What we need is similar to what is discussed here, except not as a filter
but as an actual query:
http://lucene.472066.n3.nabble.com/filter-query-from-external-list-of-Solr-unique-IDs-td1709060.html
We'd like to implement a query parser/scorer that would allow us to combine
SOLR searches with sear
