(PECL solr >= 0.9.2)
SolrQuery::addField — Specifies which fields to return in the result
$field) : SolrQuery
This method is used to used to specify a set of fields to return, thereby restricting the amount of data returned in the response.
It should be called multiple time, once for each field name.
The name of the field
Returns the current SolrQuery object