Ensures that Solr will return available results, even if there are many
misses when using check_access(), by asking Solr for more results if the
counter says there should be more.
Improves performance by ending processing as soon as the requested page
of results is processed. Remaining number of pages is an "estimate"
based on the total result count from Solr and how many items we have
rejected up to this point.
Eric Merrill