(PECL solr >= 0.9.2)
SolrInputDocument::merge — Merges one input document into another
Merges one input document into another.
sourceDoc
The source document.
overwrite
If this is true
it will replace matching fields in the destination document.
成功した場合に true
を、失敗した場合に false
を返します。 In the future, this will be modified to return the number of fields in the new document.