(PECL solr >= 0.9.2)
SolrInputDocument::merge — Merges one input document into another
Merges one input document into another.
The source document.
If this is TRUE it will replace matching fields in the destination document.
Zwraca TRUE w przypadku powodzenia, FALSE w przypadku błędu. In the future, this will be modified to return the number of fields in the new document.