Solr IdsExportPlugin
Solr Plugin I wrote when I worked for Allegro.
A plugin (to be more precise: set of plugins) for Solr allowing time-efficient export of Ids of all found documents (or
any DocValues-enabled field values) in comma-separated format without sorting. Lack of result sorting results in
significantly better performance then Solr build-in /export endpoint.
Link: IdsExportPlugin