The parser team would like to write a query for "patches to core affecting files under includes/parser" to support our work for T88531: Goal: Organize a Gerrit Cleanup Day on September 23, 2015.

According to gerrit's documentation, the required query would be something like:

(project:^mediawiki/core AND file:^includes/parser.*)

...but when you run that on our gerrit instance, it says, secondary index must be enabled for file:^includes/parser.*.

Can we get that "secondary index" enabled on our gerrit instance, perhaps just temporarily for gerrit cleanup day?