Reindex a select group of nodes
In case you don't find a better way (doesn't look like there's an existing Drush command), here's a pretty simple solution cobbled together from various functions in the module:

$solr = apachesolr_get_solr();
$nids = array(1, 2, 3, 4, ...);
foreach ($nids as $nid) {
  $solr-&gt;deleteById(apachesolr_document_id($nid));
  db_update('apachesolr_search_node')
    -&gt;condition('nid', $nid)
    -&gt;fields(array('changed' =&gt; REQUEST_TIME, 'status' =&gt; 1))
    -&gt;execute();
}
apachesolr_index_set_last_updated(REQUEST_TIME);


Untested, use with caution!