As a quick-win measure to limit the effect of data analysis on the primary, the sampling will be done with secondaryPreferred read option.

The readPreference can be passed to the driver here:

https://github.com/mongodb-js/compass/blob/0f73014d264419306677ae1b1adbccbac1874539/packages/data-service/src/data-service.ts#L2625

.collection(this._collectionName(ns), {
  readPreference: ReadPreference.SECONDARY_PREFERRED,
});