I am using solr 5.2 version with Node JS 4. I need to export millions of records each having only 3 columns. The columns does not need any solr features for scoring. Also 2 of the columns are constants. I dont need to have any sorting functionality. But when using export handler or streaming expressions, sorting is mandatory and also only 'json' format is possible. So is using '/export' handler or streaming expressions possible with no sorting and in 'csv' format? Also is there any node client similiar to solrj(Java client for solr) what supports streaming expressions. I find using the '/select' query handler causes large increase in solr heap memory when fetching records. I give the solr query as q=*:*&fq=.... Will using the '/export' handler or streaming expressions lead to less consumption of solr heap memory for millions of records?.
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