[[indices-ttl]] === TTL interval Documents that have a <> value set need to be deleted once they have expired. How and how often they are deleted is controlled by the following dynamic cluster settings: `indices.ttl.interval`:: How often the deletion process runs. Defaults to `60s`. `indices.ttl.bulk_size`:: The deletions are processed with a <>. The number of deletions processed can be configured with this settings. Defaults to `10000`.