Vacuuming cleans up document references made obsolete by
discard from the index. On large indexes, vacuuming is
potentially costly, because it has to traverse the whole inverted index.
Therefore, in order to dilute this cost so it does not negatively affects the
application, vacuuming is performed in batches, with a delay between each
batch. These options are used to configure the batch size and the delay
between batches.
Options to control vacuuming behavior.
Vacuuming cleans up document references made obsolete by discard from the index. On large indexes, vacuuming is potentially costly, because it has to traverse the whole inverted index. Therefore, in order to dilute this cost so it does not negatively affects the application, vacuuming is performed in batches, with a delay between each batch. These options are used to configure the batch size and the delay between batches.