(PECL solr >= 0.9.2)
SolrInputDocument::addField — Adds a field to the document
$fieldName, string $fieldValue, float $fieldBoostValue = 0.0): boolFor multi-value fields, if a valid boost value is specified, the specified value will be multiplied by the current boost value for this field.
fieldNameThe name of the field
fieldValueThe value for the field.
fieldBoostValueThe index time boost for the field. Though this cannot be negative, you can still pass values less than 1.0 but they must be greater than zero.
成功時(shí)返回 true， 或者在失敗時(shí)返回 false。