I'm using Search API Solr with custom searches in code, but I want to find a way to limit the return results to only the nid to save on bandwidth with our third-party solr server. I've tried $query->fields(array('nid')) but I receive the following error.
SearchApiException: Trying to search on field nid which is no indexed fulltext field.
I am using the following code (simplified).
$index = search_api_index_load('my_index'); $query = $index->query(); $query->keys($search_terms); $query->fields(array('nid')); // doesn't work $results = $query->execute(); return $results;
How do I get only node IDs from