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(PECL solr >= 0.9.2)
SolrDocument::merge — Merges source to the current SolrDocument
$sourceDoc 
   [,  bool $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.
      
   成功时返回  TRUE , 或者在失败时返回  FALSE 。