The memory leak seems to be in: org.apache.solr.handler.component.ShardFieldSortedHitQueue
I think our issue might be related to this one, because this change has been introduced in 4.7 and has changes to ShardFieldSortedHitQueue:
https://issues.apache.org/jira/browse/SOLR-5354 Is the memory leak a bug, or should a full reindex help? Martin
