Should be an array of Apache_Solr_Document instances
$allowDups
—
boolean
$overwritePending
—
boolean
$overwriteCommitted
—
boolean
$commitWithin
—
integer
The number of milliseconds that a document must be committed within, see @{link http://wiki.apache.org/solr/UpdateXmlMessages#The_Update_Schema} for details. If left empty this property will not be set in the request.