The Soft index file store reads the data and index files at start up even if the store is configured as purge on startup. If the index is dirty this means it must build the entire index just to throw it away soon after. We should instead just delete the data and index directories in the store itself and avoid this extra step of reading these contents and it will improve startup performance.

Also looking closer it also improves startup performance when the index is present as well when purge is enabled.