Andrew Artemyev brought up this idea on the opennms-discuss list (http://markmail.org/thread/o5uf5ie5fpvwffzj)
After creating a custom resourceType, it would be nice to have a way to limit the number of indices (indexes) which have data collected. This may be similar to choosing which interfaces of a switch are included in data collection. Presently, when a custom resourceType is defined to collect arbitrarily indexed data (via SNMP), all indices are collected on. In some cases there may be only a few interesting indices to collect data on among hundreds or thousands. The problem is exacerbated if multiple data points are defined for collection.