SOLR Num Docs vs NumFound

[Nathan Findley]

On my solr 4 setup a query returns a higher "NumFound" value during a 
*:* query than the "Num Docs" value reported on the statistics page of 
collection1. Why is that? My data is split across 3 data import handlers 
where each handler has the same type of data but the ids are guaranteed 
to be different.

Are some of my documents not hard commited? If so, how do I hard commit. 
Otherwise, why are these numbers different?

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