When are knowledge bundles distributed to search peers?

"The search head replicates the knowledge bundle periodically in the background or when initiating

a search. " "As part of the distributed search process, the search head replicates and distributes its

knowledge objects to its search peers, or indexers. Knowledge objects include saved searches, event

types, and other entities used in searching accorss indexes. The search head needs to distribute this

material to its search peers so that they can properly execute queries on its behalf."

Reference: https://docs.splunk.com/Documentation/Splunk/8.0.5/DistSearch/Whatsearchheadssend