(PECL solr >= 0.9.2)
SolrQuery::getTermsLimit — Returns the maximum number of terms Solr should return
public SolrQuery::getTermsLimit ( ) : int
Returns the maximum number of terms Solr should return
This function has no parameters.
 Returns an integer on success and null if not set. 
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    https://www.php.net/manual/en/solrquery.gettermslimit.php