schedule.incremental_crawl_ratio

This option is a number: if greater than zero it specifies the "ratio" of the number of full crawls vs. the number of incremental crawls during an update. When set, a scheduled update will perform N incremental updates and then perform a full update. If set to -1 then a scheduled update will always try to perform an incremental update.

Incremental crawling is used to reduce the amount of network traffic required to gather documents by only downloading new or modified documents.

Set this configuration key in the search package or data source configuration.

Use the configuration key editor to add or edit the schedule.incremental_crawl_ratio key, and set the value. This can be set to any valid Integer value.

To perform 3 incremental updates, followed by a full update:

To never perform an incremental update:

To always perform an incremental update: