Error in the 'create grok index pack' step on Linux/ChromeOS builders:

"usage: package_index.py [-h] --path-to-archive-output PATH_TO_ARCHIVE_OUTPUT
                        --path-to-compdb PATH_TO_COMPDB
                        [--index-pack-format {grok,kythe}]
                        [--keep-filepaths-files KEEP_FILEPATHS_FILES]
package_index.py: error: argument --keep-filepaths-files: expected one argument"

Example:

https://build.chromium.org/p/chromium.infra.cron/builders/Chromium%20Linux%20Codesearch/builds/3533/steps/create%20grok%20index%20pack/logs/stdio