Indexing can be paused and restarted through the and . This enables you to pause lengthy indexing operations during peak hours and continue at a time of low activity, for example, after office hours.
NOTE
Pausing an index during a merge stops users from finding emails in that archive store through the search feature. Pausing a rebuild does enable users to use the archive store.
and 
. This enables you to pause lengthy indexing operations during peak hours and continue at a time of low activity, for example, after office hours.