If I explicitly set a refresh_interval on an index, will it still run the refresh operation, even if no new documents have been indexed to it since the last refresh?
I'm trying to understand if setting an explicit refresh interval ends up being more costly, because it disables the automatic idle-functionality that I know happens if no searches are being made as described here. I wonder if thats the case for index operations as well.
If it does the refresh in any case when explicity set, are refreshes on an index that hasn't changed expensive or near zero cost?
Possibly linking to the source code as well would be extremely helpful. I haven't been able to find the code responsible for this.