(PECL solr >= 0.9.2)
SolrDocument::merge — Merges source to the current SolrDocument
$sourceDoc
$overwrite
true
Merges source to the current SolrDocument.
sourceDoc
The source document.
overwrite
If this is true then fields with the same name in the destination document will be overwritten.
Returns true on success or false on failure.
false