There seems to be some confusion about what solr's "last_index_time" means.
This is a fairly important thing to understand when setting Solr up to do its Delta Updates.
Solr's last_index_time holds the timestamp that is used to determine the last time an indexing operation STARTED, not as some people believe when it ended.
When performing updates this value is usually used in the delta query to select records which have been modified or updated since the last indexing operation begun. It is critical to ensure that there is no timeframe window between the "last_index_time" when doing your first full-import and your scheduled updates. Otherwise this could cause you to have some documents missing from your index.
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