RT indexes RAM chunk flush check period, in seconds. Optional, default is 0 (do not flush). Introduced in version 2.0.1-beta.

Actively updated RT indexes that however fully fit in RAM chunks can result in ever-growing binlogs, impacting disk use and crash recovery time. With this directive the search daemon performs periodic flush checks, and eligible RAM chunks can get saved, enabling consequential binlog cleanup. See Section 4.4, “Binary logging” for more details.

Example:

rt_flush_period = 3600