更新solr文档时，索引日期会更改吗？

In Solr the default ordering is ASC if two documents have the same relevancy taking in consideration the index dateTime. But lets say if one of the records is updated, the index dateTime is changed? - taking in consideration that solr when it does an update in fact delete that record and inserts it again. So when a document is updated the original indexing date is kept and an update column is modified, or the indexing dateTime is modified causing at equal relevancy a new order of the results? In Solr the default ordering is ASC if two docu