Assume i first use keyword search to get a DocIDSet from inverted index,
then i want to sort these docIds by some numeric field, like a
`updateTime`, does Lucene do this without need of loading the Document
objects but only with an sorted index on `updateTime`? Which i call it
"Index-Only Sort Opti
This comes up occasionally, it’d be a neat thing to add to Solr if you’re
motivated. It gets tricky though.
- part of the config would have to be the name of the length field to put the
result into, that part’s easy.
- The trickier part is “when should the count be incremented?”. For instance,
