Then, you will see lines as it indexes each table. Some will take a long time, others will only take a few seconds. When it is done, you will see a line saying " Attachments full re-index is finished."
If you have large primary tables and get performance issues when you deploy changes to selection fields occur consider one of the the following: (1) Deploy outside of main working hours (2) Improve the time to reindex by turning off the indexing of attachments - please see S140944