(PECL solr >= 0.9.2)
SolrDocument::offsetSet — Adds a field to the document
$fieldName
, string $fieldValue
) : voidUsed when the object is treated as an array to add a field to the document.
fieldNameThe name of the field.
fieldValueThe value for this field.
成功时返回 true， 或者在失败时返回 false。